General Contractor Estimated Taxes: Deposits, Draws, Retainage, and the Job That Spans December

General contractors meet the estimated tax system with the widest gap between cash and profit in the trades, and the accounting method decides which one the tax follows. The rules (the contractor estimated-tax guide covers the mechanics): quarterly installments on April 15, June 15, September 15, and January 15; a quarter-by-quarter underpayment penalty; avoided by the prior-year safe harbor (100% of last year's tax, 110% above US$150,000 of prior-year adjusted gross income) in equal installments, 90% of the current year's tax in equal installments, or the annualized method. The cash shape of a job: a deposit at contract (10% to 30% of the price), progress draws at milestones (demolition complete, rough-in complete, drywall, finishes), the balance at substantial completion, and — on commercial work — retainage (5% to 10% held until final completion and punch-list sign-off, released weeks or months later); against that, the subs are paid on their own draw schedules (usually after the general receives the corresponding draw, with lien waivers), the materials are paid at delivery or on the supplier's terms, and the general's crew is paid biweekly regardless; so a job's cash is positive at the deposit, roughly neutral through the draws if the general manages the sub payments to follow its receipts, and positive again at the balance — with the retainage as a trailing receivable. Which method the tax follows. The cash method (most small remodelers): income is each receipt when received — deposit, draws, balance, retainage — and expenses are each payment when paid; a job that spans December puts its deposit and early draws in this year's income and the subs' later payments in next year's deductions, so the year the job starts shows a profit that is partly the next year's costs, and the year it finishes shows the reverse; the estimate projects the year's cash profit from the job schedule (which jobs start and finish when, and where each will be in its cash cycle at December 31), and a general with many jobs in progress at year-end has a cash profit that departs from the job-cost profit by the net of deposits received less subs unpaid on the open jobs — a figure the job-cost ledger (the general contractor deductions guide) computes at each quarter's check. The completed-contract method (elected for residential construction and small contracts): a job's income and its costs are all recognized in the year the job is completed — nothing in the years in between — so a general with three additions finishing in March has three jobs' entire profit in next year's income regardless of when the cash arrived; the estimate projects completions, not receipts, and a year with many completions and few starts is a heavy tax year while the reverse is light. The percentage-of-completion method (required for larger contractors' long-term contracts other than residential construction; used by many for the books): income is recognized as costs are incurred against the estimated total — the job's profit accrues through the job — and the estimate projects the year's earned profit from the job schedule's percentage complete at each cutoff; the method that keeps tax profit closest to economic profit, and the one whose estimate the job-cost ledger produces directly. The two strategies. Prior-year safe harbor with a reserve: four equal installments of last year's tax, plus a reserve percentage of every receipt — deposits, draws, balances, retainage — moved to a tax account by rule (for most generals 25% to 35% of net profit, applied as a share of receipts through the general's thin margin on gross: a general with a 10% net margin on gross and a 32% effective rate reserves about 3.2% of every receipt — a small percentage of a large number); penalty-proof, with the reserve absorbing the method's timing and the April balance a transfer; the strategy for a cash-method general whose year-end job mix varies. The annualized method: installments computed on year-to-date profit under the general's method, annualized — following the deposits and draws (cash), the completions (completed-contract), or the earned profit (percentage-of-completion) — with Form 2210 Schedule AI at filing; the method for a general whose job-cost ledger is current at each quarter's cutoff and whose profit is lumpy by design. The S corporation general (the general contractor entity guide): the owner's salary withholding covers the tax on salary and projected distributions — deemed paid evenly across the year regardless of when withheld — through the crew's payroll, with a fall adjustment for the year-end job mix and a December payroll curing any shortfall; a general with no employees and a new payroll for one uses the same mechanism on a smaller scale. What the estimate includes: federal income tax on projected profit under the method; self-employment tax for Schedule C generals (the omitted third); the state's estimates (and the multistate question for a general working across a state line — the consulting multistate guide's framework); the crew payroll and workers' compensation as costs; the sub payments' timing (cash method — the payments, not the invoices); the retainage receivable (income when released) and the retainage payable to subs (a deduction when paid); the equipment write-offs (a truck, an owned skid steer — the fall recompute); the builder's risk and bond premiums as job costs; and — for a general with a retained-earnings policy for bonding — the distributions sized to the owners' tax, which the estimate is the input to. The quarterly check: jobs started, in progress, and completed against the schedule; each open job's cash position (deposits and draws received less subs and materials paid) and its job-cost profit to date; retainage receivable and payable; the crew's payroll against the jobs; equipment purchases; profit through the quarter under the method, annualized, against installments or withholding; the reserve balance; and the adjustment. The failure modes: estimating on deposits and draws as if they were profit (a cash-method general in a year of many starts overpays; in a year of many completions underpays); ignoring the retainage receivable in the projection (a large commercial job's retainage releasing in the fourth quarter is the quarter's income); paying the safe harbor blindly through a year whose method timing runs the other way; omitting self-employment tax; and — the trade's own — drifting between methods without an election (the estimate can't be computed on a method the return doesn't use). The calendar: January — last year closed (the open jobs' cash positions and job-cost profit, the retainage schedule, the method confirmed), the safe harbor computed, the reserve percentage set on the margin on gross (or the S corporation W-4), the job schedule projected; each receipt — reserve by rule; quarterly — the check on the job schedule and the open jobs' positions; the four installment dates; fall — the recompute for the year-end job mix (which jobs will be open at December 31 and where in their cycle), retainage releases, equipment, and the distribution policy; filing — Form 2210 Schedule AI if annualized.

Key takeaways

• A job's cash and profit disagree by design: deposit before the subs, draws through the milestones, retainage months after completion — and a job spanning December splits its cash and its costs across two tax years.
• The accounting method decides what the estimate projects: receipts and payments (cash), completions (completed-contract), or earned profit (percentage-of-completion) — and the method must be elected, not drifted into.
• Prior-year safe harbor with a reserve at a small percentage of a large gross (the general's thin margin on gross), or the annualized method on the job-cost ledger's quarterly profit under the method.
• The retainage receivable is the projection's trailing item — income when released, often in the fourth quarter of a commercial job's year; the retainage payable to subs is the matching deduction when paid.
• S corporation generals use salary withholding through the crew's payroll, with the fall recompute on the year-end job mix; bonded generals size distributions to the owners' tax from the same estimate.
• Include self-employment tax, the state, the subs' payment timing, builder's risk and bond premiums, and equipment write-offs.

The general contractor's estimated-tax routine

January: last year closed (open jobs' cash and job-cost positions; retainage schedule; method confirmed); safe harbor; reserve percentage (effective rate × margin on gross) or W-4; job schedule projected. Each receipt: reserve by rule. Quarterly: jobs started, open, completed; each open job's cash position and profit to date; retainage receivable and payable; payroll; purchases; profit under the method, annualized; adjust. Four dates. Fall: recompute — year-end job mix, retainage releases, equipment, distributions. Filing: Schedule AI if annualized. The open-jobs position and the method line are the two the trade adds.

Worked example

A cash-method residential remodeler (S corporation, three employees) projects US$260,000 of profit on US$3.2 million of gross across 20 jobs. Last year's federal income tax was about US$45,000; the owner's salary withholding is set in January, and 3.2% of every receipt is reserved by rule. The job schedule: fourteen jobs start and finish within the year; six span December. October recompute: the six open jobs at December 31 will have received US$410,000 of deposits and draws against US$280,000 of subs and materials paid — US$130,000 of cash ahead of costs — about US$80,000 more than those jobs' job-cost profit to date — that is really next year's costs (the subs' remaining draws are paid in January and February); the year's cash-method profit projects at US$340,000 rather than the US$260,000 of job-cost profit, and the December payroll's withholding is raised to cover it, with the reserve (which grew with the receipts) covering the balance. The following year the same six jobs finish: US$150,000 of subs paid against US$90,000 of final balances received — the reverse effect, and the January projection is set accordingly. A commercial general on percentage-of-completion (bonded, twelve employees): the estimate runs on earned profit from the ledger each quarter — no cash-timing distortion — with a US$220,000 retainage release on a completed municipal job projected for the fourth quarter, and distributions sized to the owners' tax from the same figures for the surety's balance sheet. The remodeler across town who paid last year's safe harbor through a year of many starts: penalty-proof, and a US$60,000 April balance on cash profit that was mostly next year's sub payments — funded from the next jobs' deposits.

Official sources

The IRS states: “Individuals, including sole proprietors, partners, and S corporation shareholders, generally have to make estimated tax payments if they expect to owe tax of $1,000 or more when their return is filed.” — Internal Revenue Service, Estimated taxes, https://www.irs.gov/businesses/small-businesses-self-employed/estimated-taxes

Publication 538 states: “Under the cash method, you include in your gross income all items of income you actually or constructively received during the tax year.” — Internal Revenue Service, Publication 538, Accounting Periods and Methods, https://www.irs.gov/publications/p538

Practitioner note

A general contractor's cash and profit disagree on every job by design, and the accounting method decides which one the estimate projects — receipts for a cash-method remodeler, completions for completed-contract, earned profit for percentage-of-completion — which is why a general drifting between methods can't compute an estimate at all. Our general contractor routine projects the year-end job mix each October (which jobs will be open and where in their cycle), carries the retainage receivable as the trailing item, and reserves a small share of a large gross on every receipt — because the year of many starts overpays and the year of many completions underpays, and the ledger knows which one this is.

See also: For related guidance, see setting up a contractor's books: chart of accounts, job costing, and the method decision; and browse every small business tax guide, by situation.

Next step

Fairlight Accounting is a cross-border accounting and tax practice with a U.S. Tax Desk and a Canadian Tax Desk. Our U.S. Tax Desk handles estimated-tax planning for general contractors and remodelers — method-specific projections from the job-cost ledger, open-job cash-position analysis at year-end, retainage receivable and payable timing, reserve rules calibrated to margin on gross, S corporation withholding adjustments, and distribution sizing for bonded contractors. See pricing or book a call.