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Window Cleaning Business Taxes and Bookkeeping: 2026 Guide
Updated April 02, 2026
Taxes on a small window cleaning operation are simpler than most businesses because your expense list is short. But that simplicity lulls new cleaners into thinking they don’t need a system. Then April hits and they owe thousands they don’t have.
The short version: set aside 25-30% of every payment, pay quarterly, track mileage, keep simple books. Miss any of those and you’ll owe penalties on top of the tax itself.
The Basics
Open a separate savings account. Every time you get paid, move 25-30% into it. Don't touch it. This covers federal income tax, self-employment tax (15.3%), and state tax.
Due dates: Jan 15, Apr 15, Jun 15, Sep 15. Use IRS Form 1040-ES or pay online at irs.gov/payments. Miss these and you'll get hit with penalties even if you pay in full in April.
The IRS mileage rate is $0.70/mile in 2026. If you drive 15,000 business miles a year, that's a $10,500 deduction. Use MileIQ (free tier) or a notebook in your truck. Log every drive to a job site, supply store, or client meeting.
What You Can Deduct
- Squeegees, channels, and replacement rubbers
- Strip washers, scrubbers, and microfiber cloths
- Ladders and water-fed poles
- Cleaning solution (Dawn, rubbing alcohol, Bar Keeper's Friend)
- Vehicle mileage ($0.70/mile) OR actual vehicle expenses (not both)
- Insurance premiums
- Marketing costs (Thumbtack, flyers, magnets, business cards)
- Phone bill (business use %)
- Software (Jobber, QuickBooks, etc.)
- Work clothes and safety gear
- Vehicle maintenance
- Business registration and LLC fees
Bookkeeping Software
| Wave | Free | Good enough until you hire someone. Invoicing, expense tracking, reports. |
| QuickBooks Self-Employed | $15/mo | Better mileage tracking and tax categorization. Worth it once you're over $3K/month. |
Get an accountant once you're over $50K/year or hiring employees. Until then, Wave + a savings account for taxes is all you need.
Common Mistakes That Cost You Thousands
New cleaners take the full $280 home from a 20-window house job, then owe the IRS $80 of it next April. By then the money is gone. Open a separate savings account your first week and move 25-30% of every payment in, automatic.
If you owe more than $1,000 in tax for the year, the IRS expects quarterly payments. Miss them and you pay penalties even if you square up in April. Set calendar reminders for Jan 15, Apr 15, Jun 15, Sep 15.
At $0.70 per business mile in 2026, a window cleaner driving 12,000 business miles a year loses an $8,400 deduction by not logging it. That's real money. Use MileIQ or a notebook, but log every drive to a job site, supply run, or commercial sales call.
Running everything through one bank account and one credit card creates a bookkeeping nightmare and makes an audit terrifying. Open a free business checking account (Novo, Mercury, Bluevine) and use it exclusively for business.