A small construction company needs more than a general income-and-expense ledger. Set up a separate business bank account, a chart of accounts that distinguishes direct job costs from overhead, job and cost-code tracking, progress billing and retainage records, and a weekly cash forecast. Then close the books every month and review project margin, work in progress, receivables and upcoming commitments.
This system shows whether each job is profitable, whether billed money will arrive before payroll and supplier payments are due, and which commitments could create a shortfall. The steps below are designed for a contractor managing its own records or supervising an outside bookkeeper.
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What construction bookkeeping must capture
Ordinary small-business bookkeeping records sales, expenses, assets, liabilities and owner equity. Construction bookkeeping adds a project layer to every material transaction. A payment, labor hour or supplier bill must be connected to the contract and, where useful, to a phase or cost code.
The five records that make the system construction-ready
- Job record: one file or ledger for each contract, with the signed scope, estimate, budget, approved changes, invoices, receipts, subcontractor documents and collection history.
- Cost codes: consistent categories such as field labor, concrete, framing, electrical, equipment rental, permits or job travel. Use the same codes in the estimate, purchase orders, bills and reports.
- Progress billing: invoices tied to agreed milestones or a documented percentage of completion rather than an informal request for payment.
- Retainage: amounts a customer withholds until contractual conditions are met. Record the withheld balance separately from cash that is available to spend.
- Commitment and forecast data: purchase orders, subcontractor commitments, scheduled payroll, taxes, debt service and equipment purchases that may not yet appear as paid expenses.
A job can show accounting profit while the company lacks cash. For example, revenue may be recorded before a progress invoice is collected, while payroll and material bills are due this week. Project bookkeeping and cash forecasting must therefore be reviewed together, not as substitutes for one another.
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Build the financial foundation first
1. Separate business and personal money
Open a business checking account and use it only for company activity. The IRS says in Publication 583: "One of the first things you should do when you start a business is open a business checking account. You should keep your business account separate from your personal checking account."
Use a business card or clearly identified payment method for company purchases. If an owner pays a business bill personally, record it as an owner contribution or reimbursement with the receipt attached; do not leave it as an unexplained bank transaction. Likewise, record owner draws separately from job costs and overhead.
Keep an organized source-document trail for:
- customer contracts, amendments and approved change orders;
- customer invoices, payment confirmations and deposit records;
- vendor invoices, receipts, purchase orders and subcontractor bills;
- employee time records, payroll reports and payroll-tax filings;
- bank and card statements;
- equipment, loan and lease documents; and
- insurance, permit and professional-fee records.
Reconcile the bank and card accounts on a regular schedule. Reconciliation matches the ledger to the statement, identifies missing or duplicated transactions and creates the audit trail needed to support reported income and expenses.
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2. Choose an accounting method with advice
IRS Publication 334 explains that a business may generally use cash, accrual or another permitted method, but the method must clearly reflect income. Construction companies should not choose a method only because it makes the current bank balance or tax result look better.
Inventory and long-term construction contracts can trigger special tax and reporting rules. Before the first return, and whenever the company changes its work mix or legal structure, ask a construction-experienced CPA to confirm the permitted method, contract treatment and any required changes. Keep the tax method and the internal job-cost reports understandable to the people managing the work; a tax election does not eliminate the need to track commitments and work in progress.
3. Create a chart of accounts that mirrors the work
Start with the accounts required for financial statements, then add enough detail to answer job-management questions. A practical structure separates direct costs from overhead and keeps cash, receivables, payables, taxes and financing visible.
| Account group | Examples | Why it matters |
|---|---|---|
| Direct job costs | Field labor, materials, subcontractors, equipment rentals, permits and job travel | Shows the cost of producing a specific contract and supports job-margin analysis |
| Overhead | Office payroll, rent, insurance, vehicles, software and professional fees | Shows what the company must cover after project gross margin |
| Receivables | Trade accounts receivable and retainage receivable | Separates billed amounts from cash collected and identifies withheld balances |
| Payables and payroll liabilities | Vendor payables, subcontractor payables and payroll taxes | Shows commitments that can consume cash before a customer pays |
| Financing and equity | Loans, credit lines, equipment debt and owner equity | Keeps financing activity out of operating revenue and expense reports |
Do not create a separate general-ledger account for every customer or every project. Use the customer, project and cost-code fields in your bookkeeping system for that detail, while keeping the chart of accounts stable enough for consistent reporting.
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Set up job and cost-code tracking
Create a job record before spending begins
Assign each contract a unique job number and enter the customer, site, contract value, start and expected completion dates, billing terms, retainage terms and responsible project manager. Attach the signed agreement and the original estimate. If a contract has phases, give each phase a code that can be used by field staff, purchasing and the bookkeeper.
The estimate should contain the same cost-code structure used after work starts. At minimum, track the planned quantity or labor, estimated cost, committed cost, actual cost, billed revenue and cost-to-complete for each major phase.
Capture every cost at its source
- Labor: Require employees to submit time by job and cost code. Approve timesheets before payroll is posted.
- Materials: Put the job number on purchase orders, delivery tickets and vendor invoices. If one invoice serves several jobs, allocate it at line level rather than charging the whole bill to one project.
- Subcontractors: Match the subcontractor invoice to the contract, approved work, lien or payment documentation required in your jurisdiction, and the correct job code before approval.
- Equipment: Record rentals to the job that uses them. For company-owned equipment, establish a consistent internal allocation policy and apply it consistently.
- Other direct costs: Code permits, testing, disposal, freight and job travel to the project when they are directly attributable.
Make coding part of the approval workflow. A bill that is paid without a job number may be impossible to assign accurately later, which weakens both the job report and the tax records.
Review estimate, commitments and actuals together
At least monthly, compare the original estimate with approved changes, committed costs, costs posted to date and the latest cost-to-complete estimate. A low amount paid to date does not necessarily mean a phase is under budget if large purchase orders or subcontractor commitments are already signed.
Review gross margin by project and phase while corrective action is still possible. Investigate variances such as labor hours above plan, material price changes, rework, unapproved extra work or a subcontractor invoice that belongs to another phase. Record the reason and the action owner, rather than simply changing the estimate to make the variance disappear.
Bill correctly and protect receivables
Use the contract’s billing rules
Invoice against the agreed milestone, schedule of values or documented completion percentage. Each invoice should identify the job, billing period, completed work, approved changes, prior billings, current amount, retainage and amount due. Keep evidence supporting the percentage or milestone so a customer can see how the total was calculated.
Set a calendar reminder for every submission requirement, including required forms, backup, waivers or approvals. A correct invoice submitted late can create the same cash problem as an incorrect invoice.
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Record retainage separately
Post retainage as a separate receivable when the contract permits it. The retained amount is part of the customer’s obligation but is not available to pay this week’s payroll or suppliers. Track the release condition and expected release date, and reconcile the retainage ledger to customer statements.
Control change orders before extra work
Require written customer approval for scope, price and schedule changes before the additional work starts. Link the approved change to the job budget and the next invoice. If an emergency requires work before a formal signature, document the instruction, estimate the exposure and obtain written confirmation as soon as possible. Never treat an unapproved field request as collectible revenue.
Run an accounts-receivable aging list
Review open invoices by customer and age at least weekly. Assign a follow-up date and owner to every overdue balance. Separate ordinary unpaid invoices from disputed amounts, missing paperwork and retainage so the collection plan addresses the actual cause. Escalate a customer whose balance is growing while new work is being requested; continuing to spend can increase the eventual loss.
Build a rolling cash-flow forecast
A forecast answers a different question from the profit-and-loss statement: will enough cash be available on each payment date? Start with the bank balance you actually have, not with accounting profit or an invoice that has not been collected.
Use this weekly structure
| Forecast line | What to enter | Control question |
|---|---|---|
| Opening cash | Cleared balances in business bank and operating accounts | Does this agree with the latest reconciled statements? |
| Expected receipts | Customer, invoice, expected date, amount and confidence level | Is the date supported by a payment commitment, or is it only an assumption? |
| Payroll and taxes | Next payroll, payroll taxes and other scheduled employment costs | Are time, overtime and tax liabilities complete? |
| Suppliers and subcontractors | Approved bills, due dates and committed purchase orders | Which payments are contractually or operationally difficult to defer? |
| Debt and equipment | Loan payments, leases, deposits and planned purchases | Can a purchase be staged without disrupting the job? |
| Other operating outflows | Rent, insurance, fuel, permits, software and professional fees | Are annual or irregular bills included in the week they are due? |
| Closing cash | Opening cash plus expected receipts minus planned outflows | Does the balance stay above the company’s minimum reserve? |
Update it every week
- Reconcile the prior week’s actual bank balance and replace forecast receipts and payments with what really happened.
- List expected receipts by customer and date, then mark amounts that are late, disputed, dependent on a milestone or subject to retainage.
- Add all committed outflows, not just bills already entered. Include approved subcontract work, material orders, payroll, taxes, debt service and equipment deposits.
- Calculate the projected closing balance for each week far enough ahead to cover the longest collection cycle and major scheduled commitments.
- Compare the lowest projected balance with the minimum reserve. If it falls below the threshold, decide early whether to accelerate a collection, stage a purchase, negotiate supplier timing, defer a nonessential expense or arrange financing.
Test three cases
Maintain a base case using the most supportable collection dates, a slow-collection case that pushes uncertain customer receipts later, and an overrun case that increases costs on jobs with known risk. The purpose is not to invent a precise industry benchmark; no universal reserve percentage applies to every contractor. Set a minimum reserve from your own payroll, tax, supplier and debt commitments, then test whether the company can survive the delayed receipts and cost overruns shown in the forecast.
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Use the forecast to make operating decisions
If the forecast is tight, prioritize actions that improve timing without creating a larger loss: submit complete invoices promptly, collect overdue balances, obtain written approval for changes, stage material purchases, and discuss terms with suppliers before a due date is missed. Do not conceal a shortfall by delaying payroll taxes, ignoring retainage, or coding personal spending as a job cost.
Close and review the books each month
A monthly close turns a stream of transactions into information the owner can act on. Set a fixed close date and assign each task to a person who can complete it and another person who can review unusual items.
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Monthly close checklist
- Reconcile every business bank and card account to the statement.
- Confirm that all customer receipts, vendor bills, subcontractor invoices and payroll entries for the month are posted.
- Review accounts-receivable aging, including disputed invoices and retainage.
- Review accounts payable and unpaid commitments, not just checks already issued.
- Post payroll liabilities, recurring accruals and other expenses belonging to the month.
- Update each active job’s billed revenue, committed cost, actual cost and cost-to-complete.
- Compare estimated and current gross margin by job and phase; document material variances.
- Check whether project gross margin covers office overhead and whether overhead spending is on plan.
- Reconcile loan, equipment and owner-equity balances.
- Save the close report and supporting documents in a period-labeled folder with restricted editing.
Controls for a small team
Even when one person performs most bookkeeping, separate approval from payment where practical. The person who creates a vendor should not be the only person approving and paying that vendor. Require approval for new bank details, unusual refunds, owner transactions, write-offs and changes to a job budget. Use unique logins, multi-factor authentication and a documented backup process. These controls protect cash and make errors easier to trace.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Spreadsheet or accounting software?
A spreadsheet can work for a very small operation with few simultaneous jobs, disciplined coding and one person responsible for reconciliation. It becomes fragile when several users enter transactions, invoices require progress schedules, retainage spans months, or management needs a reliable audit trail.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstall| Decision area | Spreadsheet workflow | Dedicated accounting workflow |
|---|---|---|
| Job-cost detail | Flexible but dependent on manual formulas and consistent data entry | Project and cost-code fields can flow into reports and invoices |
| Bank reconciliation | Transactions are imported or entered and matched manually | Bank feeds and reconciliation tools can reduce duplicate entry, but each match still needs review |
| Billing and payments | Invoices, payment status and retainage often require separate tabs | Invoicing, payment records and receivables aging can be connected |
| Multiple users | File permissions are difficult to manage and simultaneous edits can create conflicts | Role-based access and approval histories are generally available |
| Audit trail | Changes may be hard to trace unless version control is rigorous | Transaction history and user activity are typically recorded |
| Payroll and tax integrations | Often require exports and re-entry | May connect payroll, tax filings and payments; verify the exact integration before purchase |
| Reporting | Custom reports are possible but need maintenance | Job profitability, receivables, payables and cash reports can be generated from shared data |
| Total cost | Low software cost but higher risk of manual labor and correction time | Subscription, setup, training, support and integration costs; compare the full total, not only the advertised fee |
Judge a system on project tracking, cost-code granularity, progress billing, retainage, bank-feed reconciliation, reporting, user controls, audit trail, payroll and tax connections, integrations and total cost. Verify that the edition and features available in your country support your contracts before migrating data.
Common failure modes and how to correct them
Mixing personal and business transactions
Symptom: the bank reconciliation contains owner purchases, unexplained transfers and missing receipts. Fix: stop using the account for personal spending, classify historical items with supporting notes, and document every owner contribution or draw going forward.
Posting all costs to “construction expense”
Symptom: the income statement looks complete but no one can tell which job or phase lost money. Fix: establish a short, shared cost-code list and require a job number before a bill, time entry or purchase order is approved.
Treating invoiced revenue as cash
Symptom: the profit report is positive while payroll or supplier payments are at risk. Fix: separate billed receivables and retainage from cleared cash, then maintain the rolling forecast by expected collection date.
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Ignoring commitments
Symptom: the forecast looks safe until several subcontractor invoices arrive together. Fix: enter approved purchase orders and subcontract commitments when they are made and update the cost-to-complete estimate when scope changes.
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Starting extra work without written approval
Symptom: labor and materials rise but the customer disputes the invoice. Fix: require written scope, price and schedule approval before proceeding, and retain the approval with the job record.
Letting retainage disappear into ordinary receivables
Symptom: the aging report suggests cash is collectible now even though the contract withholds it. Fix: use a separate retainage-receivable account and track its release condition and date.
Choosing a tax method without construction advice
Symptom: financial reports and tax filings treat long-term contracts or inventory inconsistently. Fix: have a construction-savvy CPA review the accounting method and contract treatment before filing and whenever the business changes its work mix.
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Days 1–30: establish control
- Open or designate the business checking and card accounts.
- Gather contracts, invoices, receipts, payroll records, statements and loan documents.
- Choose the accounting method with professional advice.
- Approve the chart of accounts, job-number format and initial cost-code list.
- Reconcile opening balances and identify unresolved transactions.
Days 31–60: make jobs measurable
- Enter every active contract, estimate, phase and billing term.
- Require job and cost-code fields on time, purchasing and payable workflows.
- Set up progress billing, retainage tracking, change-order approval and receivables aging.
- Produce an estimate-versus-actual report for each active job and correct coding errors.
Days 61–90: make cash predictable
- Start the weekly forecast with reconciled opening cash.
- Add expected receipts, payroll, taxes, supplier and subcontractor commitments, debt and equipment outflows.
- Set a minimum reserve based on the company’s own obligations and test delayed-collection and overrun cases.
- Complete the first formal monthly close and save the supporting reports.
- Review the process with the owner, project managers, bookkeeper and CPA; assign an owner and due date to every recurring task.
When to bring in a construction specialist
Use a construction-focused CPA or bookkeeper when the company is selecting or changing an accounting method, reporting long-term contracts, managing significant retainage, expanding across jurisdictions, preparing complex payroll or tax filings, or facing disputed revenue and notice requirements. Professional review is also worthwhile when job reports disagree with the tax books or when the owner cannot explain the next eight to twelve weeks of cash commitments.
Bring the specialist the source documents, job budgets, open receivables, retainage schedule, committed costs and current forecast. A review based only on a bank balance cannot identify unbilled work, future subcontractor obligations or a margin problem hidden in one phase.
Bottom line
Set up bookkeeping around the way construction work is delivered: separate finances, preserve source documents, reconcile routinely, code every cost to the right job, bill milestones accurately, isolate retainage and review project margin. Pair that system with a weekly forecast that starts with actual cash and includes realistic collections and every committed outflow. The result is a reliable answer to both questions that matter: which jobs are earning money, and whether the company can pay its obligations before the next customer payment arrives.
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