Cabinet Installation Estimated Taxes: Deposits, Progress Draws, and Why Cash in the Account Is Not Profit

Cabinet installers meet the estimated tax system with two complications: seasonality, which every contractor has, and a deposit structure that makes cash a poor proxy for profit. 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 paying 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 matching each quarter's actual income. The deposit problem: a US$40,000 kitchen signed in March with a 50% deposit puts US$20,000 in the account before a sheet of plywood is bought — cash, not profit (the job's materials, labor, and installation costs come in April through June, and the profit is known when the job closes); an installer who estimates on the bank balance in March pays tax on deposits that will be consumed by costs, then finds the second quarter cash-poor when the materials bills arrive and the progress draw hasn't; the reverse happens at install, when the balance payment arrives after the costs are paid and looks like pure profit. The fix is bookkeeping: customer deposits booked as liabilities (the construction bookkeeping guide), job costs coded to jobs, and profit recognized when earned — so the quarterly profit figure the estimate runs on is the job cost system's number, not the bank statement's; under the cash method for tax (which most small cabinet businesses elect), income is recognized when received and costs when paid, so the tax computation itself follows cash — but the estimate should still be computed on the year's projected profit rather than a quarter's cash swing, with the annualized method's quarterly computations using year-to-date income and expenses under the cash method (deposits received are income; materials paid are expenses — the annualized figure through a quarter nets them). The seasonal pattern: the renovation cycle puts signings and deposits in late winter and early spring (homeowners planning summer kitchens), installs in late spring through summer, a second signing wave in late summer for fall installs, and a trough from Thanksgiving through January — milder than a boat detailer's season (the detailing estimated-tax guide) but pronounced enough that equal installments overpay in April relative to profit earned and the January installment lands in the trough. The two strategies. Prior-year safe harbor with a reserve: four equal installments of last year's tax, funded from a reserve (a percentage of every deposit and draw moved to a tax account when received — for most installers 25% to 35% of net profit, applied as a calibrated percentage of gross receipts) — simple, penalty-proof, with an April balance in a growth year and a refund in a down year; the deposit structure helps here, because the deposits fund the reserve early. The annualized method: installments computed on year-to-date income and expenses annualized — a modest first installment (the winter trough's income plus the spring deposits, less the costs paid), a larger second (spring installs), a large third (summer installs and fall deposits), a moderate fourth — with Form 2210 Schedule AI at filing; the method suits an installer whose books are current and whose season is pronounced. The S corporation installer (the entity guide): the owner's salary withholding covers the tax on salary and can be set to cover the tax on distributions too — withholding is deemed paid evenly through the year regardless of when withheld — so a December payroll with heavy withholding cures the year, and the seasonal problem largely disappears. What the estimate includes: federal income tax on projected profit; self-employment tax for Schedule C installers (15.3% on 92.35% of net earnings up to the US$184,500 Social Security wage base for 2026, then 2.9% — the omitted third); the state's estimates under its own system; and the equipment adjustment — a year with a CNC router or a van expensed under bonus depreciation (the deductions guide) may have far less taxable profit than the operating numbers suggest, and the fourth-quarter recompute (or the annualized method's fourth computation) captures it; the prior-year safe harbor in an equipment year overpays and refunds. The reserve percentage: set from last year's effective rate (federal plus state plus self-employment tax as a share of net profit), converted to a percentage of receipts using the shop's margin (a shop with 20% net margin and a 30% effective rate reserves about 6% of every receipt — deposits and draws included), and moved by rule on every deposit; the reserve's balance at each quarter-end is the funding check. The failure modes: paying on the March deposit balance (overpaying, then cash-poor in the second quarter); skipping the January installment because the trough left no cash (a fourth-quarter penalty on the fall's real profit); omitting self-employment tax; paying nothing until the summer installs (first- and second-quarter penalties even when the year's total is met); and — in an equipment year — paying the safe harbor and waiting a year for a refund the fourth-quarter recompute would have kept. The calendar: January — close last year, compute the safe harbor, set the reserve percentage, choose the method; each deposit and draw — reserve by rule; the four dates — pay (equal or annualized); fall — recompute for equipment and actual profit; filing — Schedule AI if annualized.

Key takeaways

• Deposits are cash, not profit: book them as liabilities, code costs to jobs, and estimate on the job cost system's profit — not the March bank balance that materials will consume.
• The safe harbors: prior-year (100%/110%) in equal installments, funded from a reserve the deposits build early; or the annualized method following the renovation cycle with Form 2210 Schedule AI.
• The renovation cycle: deposits late winter and spring, installs spring through summer, a second wave in fall, a trough through January — equal installments overpay in April and land in the trough in January.
• S corporation installers use salary withholding (deemed paid evenly) to cover the total tax, curing any shortfall in December.
• Include self-employment tax and the state; recompute in equipment years — a bonus-depreciated CNC or van can cut the year's tax below the safe harbor.
• Reserve by rule on every receipt — a percentage set from last year's effective rate and the shop's margin — so the January installment is funded from the fall's draws.

The installer's estimated-tax calendar

January: last year closed; safe harbor computed; reserve percentage set (effective rate × margin); method chosen. Each deposit and draw: reserve transfer by rule. April 15, June 15, September 15, January 15: installments. Fall: recompute for equipment write-offs and actual profit. Filing: Schedule AI if annualized. The calendar's one cabinet-specific line is the first: deposits are not profit.

Worked example

A custom cabinet business (Schedule C) nets US$118,000 for the year on US$540,000 of revenue — a 22% margin, an effective rate of 31% (federal, state, self-employment), and a CNC router purchased in October and expensed under bonus depreciation. Cash pattern: US$95,000 of deposits in February and March (six spring kitchens signed), materials and payroll for those jobs in April through June, progress and final draws through July, a second deposit wave in August, fall installs through November, and near-zero receipts in December and January. Prior-year safe harbor: last year's tax was US$34,000 — four installments of US$8,500, the April one funded from the reserve the February deposits built (7% of every receipt — 31% of a 22% margin); the router's write-off cuts this year's actual tax to about US$28,000, so the safe harbor overpays by US$6,000 and refunds in April. Annualized method instead: a first installment computed on year-to-date cash income less expenses through March (the deposits received less the materials not yet paid — a larger annualized figure than profit would suggest, which the method handles because the second quarter's costs pull the annualized figure back down), a second installment on the spring's installs, a third on the summer peak, and a fourth computed after the router's write-off — small; Form 2210 Schedule AI at filing, no penalty, no overpayment. She chooses annualized because the router made this an equipment year and her books are current. Her competitor estimated on the March bank balance — paid a large April installment on deposits that April's plywood consumed, skipped June (cash-poor), skipped January (the trough), and paid a penalty on two quarters despite overpaying the year in total.

Official sources

The IRS states that "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," and that the penalty is avoided by paying "at least 90% of the tax for the current year, or 100% of the tax shown on the return for the prior year, whichever is smaller" (110% if prior-year AGI exceeded $150,000). — Internal Revenue Service, Estimated taxes, https://www.irs.gov/businesses/small-businesses-self-employed/estimated-taxes

The IRS states: "The self-employment tax rate is 15.3%. The rate consists of two parts: 12.4% for social security (old-age, survivors, and disability insurance) and 2.9% for Medicare (hospital insurance)." Self-employment tax is figured on Schedule SE on 92.35% of net earnings, with one-half of the tax deductible. — Internal Revenue Service, Self-employment tax (Social Security and Medicare taxes), https://www.irs.gov/businesses/small-businesses-self-employed/self-employment-tax-social-security-and-medicare-taxes

Practitioner note

Cabinet installers' estimated-tax problem is a deposit problem before it's a seasonal one: half the contract arrives before the first sheet of plywood, and the installer who estimates on the bank balance overpays in March and goes cash-poor in June. Our setup books deposits as liabilities, computes estimates on job-cost profit, reserves a margin-calibrated percentage of every receipt by rule, and recomputes in the fall of any equipment year — because the bonus-depreciated router is the reason the prior-year safe harbor overpays by a quarter of the year's tax.

See also: For related guidance, see setting up a cabinet shop's deductions; and browse every small business tax guide, by situation.

Next step

Fairlight handles estimated-tax planning for cabinet and installation businesses — deposit and job-cost bookkeeping, safe-harbor and annualized computations, reserve rules calibrated to margin, S corporation withholding, and equipment-year recomputes. See pricing or book a call.