Estimated Tax Payments for Window Cleaning Business Owners

By Yarik Yarosh, CPA ·September 5, 2026 ·3 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

Window cleaning businesses have gentler seasonality than most outdoor trades. Commercial contracts (office buildings, storefronts, restaurants) provide year-round recurring revenue, and residential work peaks in spring (post-winter cleaning) and fall (pre-holiday). A window cleaner with a 50/50 commercial-residential mix has relatively stable quarterly income, making equal quarterly estimated payments straightforward. The bigger challenge is the first year, when no prior year tax exists to anchor the calculation.

✓Key takeaway

Estimated tax basics for window cleaning owners:

Who must pay: any self-employed window cleaning business owner expecting to owe $1,000+ in federal tax.

Set-aside percentage: 25-30% of net profit covers SE tax (15.3%) + income tax.

Due dates: April 15, June 15, September 15, January 15.

Revenue patterns:

Commercial contracts (monthly or quarterly): stable, predictable
Residential one-time: seasonal (spring and fall peaks)
Storm/construction cleanup: sporadic, high-margin
Pressure washing add-on: seasonal (spring through fall)

First-year challenge: with no prior year tax to anchor the safe harbor, a new window cleaner must estimate current-year tax. The simplest approach: set aside 27% of every deposit into a separate tax savings account and pay quarterly.

When to switch to S-Corp payroll withholding: At $70,000+ net income, the S-Corp election saves FICA on distributions. Adding the owner to payroll with adjusted W-4 withholding eliminates the need for separate estimated payments.

How do estimated taxes work in Year 1?

Hypothetical example

Round numbers. A sole proprietor window cleaner, first full year. Revenue: $100,000. Expenses: $25,000. Net profit: $75,000. Single filer. No prior year tax.

Monthly cash flow:

Average monthly revenue: $8,333
Range: $5,000 (January) to $12,000 (April, October)
Average monthly expenses: $2,083
Average monthly net profit: $6,250

Set-aside approach (simplest for Year 1):

Set aside 27% of net profit each month: $6,250 x 27% = $1,688/month
Quarterly payment: $1,688 x 3 = $5,063

Year-end tax calculation:

SE tax: $75,000 x 92.35% x 15.3% = $10,594
QBI deduction: $75,000 x 20% = $15,000
Taxable income: $75,000 - $5,297 - $15,000 - $15,000 = $39,703
Income tax: approximately $4,400
Total tax: $14,994

Payments made: $5,063 x 4 = $20,250

Overpayment: $5,250 (refunded or applied to next year)
The 27% set-aside slightly overpays, which is safer than underpaying

Year 2 (prior year safe harbor):

Prior year tax: $14,994
Required quarterly payment: $14,994 / 4 = $3,749 (since AGI was under $150,000, 100% safe harbor)
This is much simpler than the Year 1 estimate

Commercial contract stability: If 60% of revenue ($60,000) comes from monthly commercial contracts ($5,000/month):

The commercial revenue provides a stable base for tax set-aside
The residential fluctuation only affects $40,000 of revenue
Set aside 27% of each commercial payment as it comes in: $5,000 x 27% = $1,350/month (automatically covers most of the quarterly payment)
Residential revenue set-aside covers the remainder

Illustrative numbers only, not a real client and not advice for your facts.

Related guides:

Window cleaning business owner setting up estimated taxes?

The Business Assessment is a fixed $250. You get a written, CPA-reviewed estimated tax schedule, the set-aside calculation, and the S-Corp break-even analysis.

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Cite this page

Yarik Yarosh, CPA. "Estimated Tax Payments for Window Cleaning Business Owners." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/window-cleaning-estimated-taxes

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.