Self-Employed Carpenter & Woodworker Tax Deductions: 2026 Schedule C Guide to Tools, Lumber & the Shop

Published: July 4, 2026 · Reading time: 9 min

TL;DR: A self-employed carpenter or woodworker deducts tools (Line 13 under Section 179), lumber and hardware that become a finished product (Cost of Goods Sold, Part III), consumables like blades, glue, and finish (Line 22), the truck (Line 9 at $0.725/mile), shop rent (Line 20), liability insurance (Line 15), and licensing and dues (Lines 23 and 27a). The two things that trip carpenters up: lumber is often COGS, not a supply, and — good news — woodworking isn't an SSTB, so you keep the full QBI deduction.

Carpentry sits in an unusual spot: part trade (you install on job sites), part maker (you build products in a shop). That split is exactly why the tax return gets confusing — the same $80 of lumber can be a supply on one job and cost of goods sold on another. Get the categories right and you protect both your income tax and your 15.3% self-employment tax. Here's the complete 2026 map for finish carpenters, framers, cabinet makers, and studio woodworkers who file Schedule C.

What Counts as a Carpenter or Woodworker for Schedule C

If customers pay you to build, install, or repair with wood and you're not their employee, you're a self-employed tradesperson filing Schedule C — whether you're a finish carpenter, framer, trim installer, cabinet maker, furniture builder, or a studio woodworker selling pieces online and at markets. Report all income on Line 1 — cash jobs and Venmo included, not just what shows up on 1099s.

Pick the right business activity code: 238350 covers finish carpentry contractors; furniture and cabinet makers use manufacturing codes in the 337xxx range.

The Carpenter's Deduction Map (2026)

Two big deductions live off Schedule C: self-employed health insurance (an above-the-line adjustment) and retirement contributions to a SEP-IRA or Solo 401(k) — both worth real money in a strong build year.

The Big One: Lumber as COGS vs. Supplies

This is where a carpenter's return diverges from a plumber's or an electrician's. Ask one question about every material purchase: does it become part of a product I sell?

• Yes — it's built into a finished piece you sell (a table, cabinets, a cutting board): the lumber, hardware, hinges, and finish are Cost of Goods Sold in Part III. COGS is calculated separately (purchases, plus any inventory math) and subtracted before you ever reach your Part II expenses.
• No — it's consumed doing the work, not sold as product (blades, sandpaper, glue, shop rags, finish you brush on a customer's existing deck): those are supplies on Line 22.
• Installed on a customer's job where you bill labor (trim, framing, a door): materials are typically a job cost — supplies on Line 22, unless you carry inventory and use COGS.

Why it matters: putting product materials on Line 22 instead of COGS overstates your Part II expenses and understates COGS, which can distort your gross profit and raise an audit flag. The dollars deduct either way — but they must land in the right place.

Tools: Section 179 vs. Supplies

Your shop is full of deductions, split by price and lifespan:

• Big machines — table saw, planer, jointer, bandsaw, CNC router, dust collector, air compressor: depreciable equipment. Use Section 179 (or bonus depreciation) to write off the full cost the year you place it in service, via Form 4562 onto Line 13.
• Small tools — chisels, clamps, a cordless drill, hand planes: usually just supplies on Line 22, or expensed outright under the de minimis safe harbor.
• Blades and bits wear out and get replaced — pure consumables on Line 22.

Don't overthink a $30 chisel; do track a $3,000 saw as a Section 179 asset.

Good News: Woodworking Isn't an SSTB

The Qualified Business Income (QBI) deduction lets pass-through owners deduct up to 20% of business profit. For high-earning consultants, lawyers, and accountants, that deduction phases out because their work is a Specified Service Trade or Business (SSTB).

Carpentry and woodworking are not SSTBs. You make and install a physical product — the opposite of a personal-service field. So a self-employed carpenter generally keeps the full QBI deduction even at higher income, subject only to the normal wage-and-property tests. That's a genuine advantage, and one more reason to track every deduction so your net profit — and your QBI base — is accurate.

Recordkeeping That Survives an Audit

Trades run on cash, hardware-store runs, and lumberyard receipts that fade in a truck console:

• Keep a separate business bank account and card so shop and personal never mix.
• Capture the itemized receipt, not just the card slip — you need to see the lumber, the hardware, the blade.
• Photograph faded thermal receipts the day you get them.
• Log mileage between the shop, the lumberyard, and job sites contemporaneously at $0.725/mile.
• Tag each material purchase COGS or supply at the point of sale so you're not sorting a shoebox in April.

Frequently Asked Questions

What can a self-employed carpenter deduct on taxes?

Tools (Line 13 under Section 179, or Line 22 for cheap ones), lumber/hardware built into products (COGS, Part III), consumables like blades and finish (Line 22), shop rent (Line 20), the truck at $0.725/mile (Line 9), insurance (Line 15), licensing (Line 23), dues and education (Line 27a), and helpers (Lines 26/11).

Is lumber a supply or cost of goods sold?

COGS if it becomes part of a finished piece you sell; a Line 22 supply (or job cost) if you install it billing labor. Consumables like blades and glue are always Line 22 supplies.

Can a carpenter write off tools under Section 179?

Yes — big machines (saw, planer, CNC) go on Line 13 via Section 179 in year one. Small hand tools are usually Line 22 supplies or de minimis expenses.

Do carpenters and woodworkers qualify for the QBI deduction?

Yes. Woodworking isn't an SSTB, so you generally keep the full 20% QBI deduction even at higher income, subject to the normal limits.

Can a woodworker deduct a home workshop?

Yes, with regular and exclusive business use — Line 30, simplified ($5/sq ft) or actual. A qualifying home shop can also make your first drive to a job site deductible.

Authoritative References

• IRS — About Schedule C (Form 1040)
• IRS Publication 334 — Tax Guide for Small Business
• IRS — Qualified Business Income Deduction (Section 199A)
• IRS Publication 946 — How To Depreciate Property

Track Every Board, Blade, and Mile to the Right Line

A carpenter's deductions hide in lumberyard runs, hardware-store trips, and a truck full of fading receipts. CentSense scans each receipt with AI, tags it to the exact Schedule C line — supplies to Line 22, tools to Line 13 — and logs mileage at the 2026 rate of $0.725/mile between the shop, the yard, and the job. Export a CPA-ready CSV at tax time. Start free with 10 AI scans a month — no credit card required; the Solo plan ($5/month) adds unlimited scanning and mileage tracking.

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This article is educational and not tax advice. Consult a qualified tax professional about your specific situation.