Quarterly Tax Planning for Solo Tradespeople: Your 90-Day Guide to Saving Taxes
As a self-employed roofer, plumber, or flooring contractor, you’re likely focused on getting the job done, not tax forms. But only thinking about taxes in April can cost you. A simple quarterly tax plan keeps you ahead, helps you find deductions for your tools, truck, and materials, and makes tax time much easier with your accountant.
READY TO TAKE ACTION?
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The Quick Answer for Solo Tradespeople
Mark four 90-day tax check-ins on your calendar, matching estimated payment deadlines: mid-April, mid-June, mid-September, and mid-January. Each check-in takes 30-60 minutes with your CPA or bookkeeper. You’ll cover three things: how much tax to pay, which business expenses to deduct, and any big business moves before the next quarter.
Estimated Tax Payments: Your Foundation as a Self-Employed Tradesperson
As a self-employed roofer, plumber, or flooring contractor, you no longer have an employer taking taxes from your paycheck. If you expect to earn $1,000 or more in profit this year, you'll almost certainly need to make estimated quarterly tax payments. Miss these, and you could face an underpayment penalty — currently around 8% a year. The 2026 deadlines are: April 15 (Q1), June 16 (Q2), September 15 (Q3), January 15, 2027 (Q4). To avoid penalties, you generally need to pay either 100% of last year's tax (110% if your income was high) or 90% of what you expect to owe this year. Most tradespeople find it simpler to pay based on last year's tax, as it’s predictable and avoids needing to guess your income all year.
Q1 (January-March): Wrap Up Last Year, Plan for This Year
Before you dive too deep into new jobs, take time to organize your records from last year. Gather all your receipts for materials, tools, fuel, and subcontractor payments. Make sure every business expense is correctly noted. If you bought new power tools, a heavy-duty ladder, or a specialty diagnostic device last year, ensure those details are ready for your CPA. This is also a good time to confirm if your home office setup (where you do estimates or schedule jobs) qualifies for a deduction. Also, discuss retirement savings with your CPA; a SEP-IRA is a common choice for solo tradespeople. An S-Corp election might save you on self-employment taxes if your business profit is consistently high (often over $60K-$80K), but always talk to your CPA about this first. Action: Make your Q1 estimated tax payment by April 15th.
Q2 (April-June): Check Your Income & Big Buys
Mid-year is when you check your progress. Look at your invoices and job bookings so far. How many roofing jobs have you completed? What's your average plumbing repair bill? Project your income for the rest of the year. If you’re much busier (or slower) than last year, you might need to adjust your estimated tax payments. Are you planning to buy a new work van, a professional tile cutter, or scaffolding soon? Section 179 allows you to write off the full cost of new qualifying business equipment this year. If you started using your personal truck 100% for job site travel, your CPA can help you track those miles or expenses. Consider paying for your annual liability insurance premium or a large order of materials for Q3 jobs early to get the deduction sooner. Action: Make your Q2 estimated tax payment by June 16th.
Q3 (July-September): Last Chance for Big Deductions
Q3 is your last clear chance to make business decisions that will affect your taxes for the entire year. After September, options become limited. Thinking of hiring another laborer for big drywall jobs or a helper for your flooring crew? Hiring before year-end can create valuable deductions. If your business is doing well, talk to your CPA about setting up a Solo 401(k). You need to elect this by December 31st to make contributions for the current tax year. Also, review any unpaid invoices. Did a client stiff you on a big remodeling job? If you've tried to collect and it’s truly uncollectible, you might be able to write off that bad debt. Action: Make your Q3 estimated tax payment by September 15th.
Q4 (October-December): Final Year-End Tax Sprint
This is the final sprint before the year closes. Most major entity elections and deduction timing decisions need to be made before December 31st. If you want a Solo 401(k) for bigger retirement savings, it *must* be established by December 31st for the current tax year. Do you have a few big projects finishing in late December or early January? You can often choose to bill clients before year-end or wait until January to shift income, depending on which year you want the income to count. Need a new specialized plumbing camera, a heavy-duty air compressor, or safety equipment? Buying it before December 31st can give you a deduction for this year. Action: Make your Q4 estimated tax payment by January 15th.
How to Get Started with Quarterly Tax Planning
Take action today. Put the four estimated payment deadlines directly into your phone calendar. Then, schedule a 30-minute quarterly check-in with your CPA or bookkeeper. Before each meeting, simply gather your records: what you earned from jobs, and what you spent on tools, materials, vehicle upkeep, and business insurance. If you don't have a CPA, the IRS Free File Fillable Forms at irs.gov let you calculate and pay estimated taxes directly. However, if you're making good money as a solo tradesperson (say, over $50,000 in profit a year), a good CPA specializing in small businesses is usually worth the investment. They often find more deductions and help you save more in taxes than their fee costs, especially for new self-employed individuals.
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FREQUENTLY ASKED QUESTIONS
What if I cannot afford to pay estimated taxes?
Pay as much as you can and file on time. The underpayment penalty is calculated on the shortfall — paying half is better than paying nothing. If you expect to owe significantly, talk to a CPA about an installment agreement with the IRS.
Do I have to pay estimated taxes if I have a W-2 job too?
If you have a W-2 job with withholding, you may be able to increase your withholding allowances to cover business income taxes rather than making separate estimated payments. Ask your CPA which approach is cleaner for your situation.
Can I deduct my home office?
Yes, if you use the space regularly and exclusively for business. The simplified method allows $5 per square foot up to 300 square feet ($1,500 maximum). The regular method deducts actual expenses proportional to the office's share of your home's square footage — higher deduction but more documentation required.