Glazier Tax Deductions: 2026 Schedule C Guide to Glass, Glazing Tools & the Supply-and-Install Materials Decision

Published: September 18, 2026 · Reading time: 10 min

TL;DR: A self-employed glazier deducts almost everything it takes to fabricate, deliver, and set glass. The glass cutting table, vacuum lifters, racks, and glazing tools go under Section 179 on Line 13; glass and glazing materials are either Cost of Goods Sold in Part III (supply-and-install, bid into the price) or Line 22 supplies (labor-only, incidentals) — see COGS vs. supplies on Schedule C; the delivery van is Line 9 at $0.725/mile (Jan 1–Jun 30) and $0.76/mile (Jul 1–Dec 31) — 2026's rate changed mid-year — or actual expenses; liability, glass-breakage, and garage-keepers coverage is Line 15; licensing and bonding are Line 23. Glazing isn't an SSTB, so the QBI deduction's SSTB phase-out doesn't apply — but the separate 20%-of-taxable-income cap always does, and it trims a real-world example below by exactly $3,220.00.

Glazing sits at an unusual intersection: it's a skilled installation trade, but for most owner-operators it's also a materials business — the glass itself is often the single biggest line item on the job, which pushes the supplies-versus-Cost-of-Goods-Sold decision to the center of the return in a way most service trades never face. Add a breakage-heavy risk profile and licensing that varies sharply by state, and glazing's deductions look meaningfully different from a labor-only trade like window cleaning or house painting. Here's every write-off mapped to the right Schedule C line for 2026, plus a full worked example of the QBI deduction done correctly.

The Equipment — Line 13 (Section 179 & De Minimis)

Section 179 — the year-one route

Anything with a multi-year life can usually be expensed 100% in year one under Section 179 on Line 13, as long as business use stays above 50%:

• A glass cutting table and glass-handling jigs
• Vacuum lifters and suction-cup glass carriers (manual or powered)
• A-frame and L-frame glass transport racks, whether van-mounted or freestanding
• A boom or scissor lift you own outright (rather than renting per job)
• Glazing tools with a real service life — power caulking guns, glass grinders, edge polishers

The 2026 aggregate Section 179 limit is $2,560,000 (Rev. Proc. 2025-32, §4.24), far beyond what a glazing business spends in a year — the limit is essentially never the binding constraint here.

De minimis safe harbor — the everyday gear

Items costing $2,500 or less per invoice can skip depreciation with the de minimis safe harbor election and go straight to supplies on Line 22. Hand-held suction cups, glass cutters, a caulking gun, shims, tape measures — receipt in, deduction done.

Glass and Glazing Materials: Line 22 Supplies or Part III COGS?

This is the decision that separates glazing from most other trades in this series, because materials — not tools — are usually the largest expense:

• Labor-only or time-and-materials. The customer or general contractor buys the glass; you install it and provide the incidentals. Glazing compound, setting blocks, gaskets, silicone sealant, spacers, and edge tape are deductible supplies on Line 22 in the year you buy them.
• Supply-and-install. You fabricate or source the glass — tempered panels, insulated glass units, storefront systems, custom shower enclosures, mirrors — and bid it into one price. That glass is inventory, and its cost belongs in Cost of Goods Sold in Part III, deducted against the job's revenue when the job is billed rather than in the year you bought the material.

The dollar deduction is identical either way — COGS and Line 22 both reduce income. What changes is timing and reporting: a pallet of glass bought in December for a January install lands in the following year's COGS, not this year's expense. Most full-service glaziers who fabricate or source their own glass run predominantly through COGS; installers working strictly with customer- or GC-supplied glass stay on Line 22. If you do both kinds of work, track material by job so it can be split at filing — see COGS vs. supplies on Schedule C for the mechanics. Keep itemized receipts; a single supplier account statement isn't sufficient backup if the IRS asks what was purchased for which job.

The Van — Line 9

Glass delivery and on-site installation both depend on the vehicle, and a rack-equipped van is usually the second-biggest deduction after materials. Two methods on Line 9:

• Standard mileage rate: 2026 has two rates because the IRS revised the rate mid-year — $0.725/mile for January 1 through June 30 (Notice 2026-10) and $0.76/mile from July 1 through December 31 (Announcement 2026-11, which modifies Notice 2026-10 and is effective beginning July 1, 2026). A full-year mileage log must be split at the July 1 boundary and each half multiplied by its own rate.
• Actual expenses: fuel, insurance, repairs, tires, and depreciation × business-use percentage. A heavy cargo van over 6,000 lbs GVWR carrying rack systems may qualify for heavy-vehicle Section 179 treatment instead of standard mileage.

You must elect the standard mileage rate the first year the vehicle is in service if you want the option to use it later. Either method requires a contemporaneous mileage log — date, miles, destination, business purpose — and the commuting rule still applies unless your home office is your principal place of business. Tolls and parking stack on top of either method.

Insurance & Bonding — Line 15

Glazing's risk profile is concentrated: a small number of mistakes generate very expensive claims.

• General liability insurance covers the cracked storefront panel, the scratched custom shower enclosure, or a fall while setting an overhead skylight or curtain wall — the trade's dominant claim type. Commercial property managers and general contractors routinely require proof of coverage before awarding work.
• Glass-breakage or inland-marine coverage protects glass in transit in the van and in staging on-site — a single dropped insulated glass unit can run into thousands of dollars.
• Garage-keepers coverage, if you store customer glass on your own premises awaiting installation.
• A surety bond, where required by a commercial contract or municipal contractor-licensing rule.

All of it is deductible on Line 15. Commercial auto coverage belongs with the vehicle — inside actual expenses if you use that method, never stacked on top of the standard mileage rate, which already assumes insurance is built into the per-mile figure. Health insurance premiums take the separate self-employed health insurance deduction on Schedule 1, not Line 15.

Licensing, Permits & Certification — Line 23 / Line 27a

• State and local contractor licenses and their renewals — Line 23; many states license glazing as its own specialty contractor category or fold it into a general/specialty contractor license
• Municipal glazing or building permits for storefront, curtain-wall, or structural glazing work
• AGRSS Registered Member status or similar glazing safety-standards certification, and any OSHA fall-protection or aerial-lift operator training for elevated work — typically Line 27a as continuing education, or Line 23 if billed together with a licensing fee
• Association dues (National Glass Association or a local trade chapter)

Everything Else — Lines 8, 11, 18, 24

• Advertising (Line 8): website, Google Local Services ads, van wrap, sample boards, before/after photos for storefront and residential marketing
• Phone & software (Line 22 / Line 18): business share of your cell plan, estimating and job-scheduling software
• Contract labor (Line 11): a 1099'd helper for large commercial storefront or curtain-wall jobs you can't cover solo
• Travel (Line 24a) for an out-of-town commercial contract; 50% of business meals (Line 24b)

The QBI Deduction: Check All Three Limits, Not Just SSTB Status

Glazing is a skilled installation trade, not a specified service trade or business (SSTB) under 26 U.S.C. §199A(d)(2) — so the SSTB income phase-out that restricts consultants, lawyers, accountants, and similar service businesses doesn't apply. That's a genuine advantage, but it's easy to stop the analysis there and assume the deduction is simply "20% of net profit." §199A has three independent limits, and only one of them is about SSTB status:

1. SSTB phase-out — doesn't apply; glazing isn't an SSTB
2. W-2 wage / 2.5%-of-property cap — only bites above the 2026 phase-in threshold ($201,750 single / $403,500 married filing jointly, per Rev. Proc. 2025-32, §4.26); most solo glaziers are well under it
3. 20%-of-taxable-income cap — applies to every filer, every year, regardless of income or SSTB status, and it's the one that actually binds most often for a modest solo trade business

Here's the full worked example.

A Realistic Solo Year

A single-filer glazier running a supply-and-install route in 2026, no employees, no other income:

node -e "
const grossReceipts = 158000;

const cogsMaterials = 34000; // glass panes, glazing compound, gaskets, sealant, setting blocks

const sec179Equipment = 9500; // glass cutting table, vacuum lifters, A-frame racks, glazing knives, heat gun
const supplies = 1450; // cut-resistant gloves, tape, shims, cleaning solvent, rags
const milesH1 = 8000, milesH2 = 8000;
const rateH1 = 0.725, rateH2 = 0.76;
const mileageH1 = milesH1 * rateH1;
const mileageH2 = milesH2 * rateH2;
const vehicle = mileageH1 + mileageH2;
const insurance = 4200; // general liability + glass breakage/inland marine + garage keepers
const licensing = 850; // contractor license, glazing certification renewal, surety bond
const contractLabor = 7500; // 1099 helper on large commercial jobs
const advertising = 1100;
const phoneSoftware = 780;
const other = 650; // AGRSS/NGA cert courses, PPE replacement

const totalExpenses = sec179Equipment + supplies + vehicle + insurance + licensing + contractLabor + advertising + phoneSoftware + other;
const grossProfit = grossReceipts - cogsMaterials;
const netProfit = grossProfit - totalExpenses;

const seTaxable = netProfit * 0.9235;
const seTax = seTaxable * 0.153;
const halfSeTaxDeduction = seTax / 2;

const standardDeduction = 16100;

const qbi = netProfit - halfSeTaxDeduction;
const taxableIncomeBeforeQBI = netProfit - halfSeTaxDeduction - standardDeduction;

const tentativeQbiDeduction = qbi * 0.20;
const taxableIncomeCap = taxableIncomeBeforeQBI * 0.20;
const qbiDeduction = Math.min(tentativeQbiDeduction, taxableIncomeCap);

const finalTaxableIncome = taxableIncomeBeforeQBI - qbiDeduction;

const fmt = n => n.toLocaleString('en-US', {minimumFractionDigits:2, maximumFractionDigits:2});

console.log('mileageH1', fmt(mileageH1));
console.log('mileageH2', fmt(mileageH2));
console.log('vehicle total', fmt(vehicle));
console.log('cogsMaterials', fmt(cogsMaterials));
console.log('grossProfit', fmt(grossProfit));
console.log('totalExpenses', fmt(totalExpenses));
console.log('netProfit', fmt(netProfit));
console.log('seTax(15.3% of 92.35%)', fmt(seTax));
console.log('halfSeTaxDeduction', fmt(halfSeTaxDeduction));
console.log('QBI', fmt(qbi));
console.log('taxableIncomeBeforeQBI', fmt(taxableIncomeBeforeQBI));
console.log('tentativeQbiDeduction(20% of QBI)', fmt(tentativeQbiDeduction));
console.log('taxableIncomeCap(20% of TI before QBI)', fmt(taxableIncomeCap));
console.log('qbiDeductionAllowed', fmt(qbiDeduction));
console.log('finalTaxableIncome', fmt(finalTaxableIncome));
console.log('cap bites by', fmt(tentativeQbiDeduction - taxableIncomeCap));
"

Output:

mileageH1 5,800.00
mileageH2 6,080.00
vehicle total 11,880.00
cogsMaterials 34,000.00
grossProfit 124,000.00
totalExpenses 37,910.00
netProfit 86,090.00
seTax(15.3% of 92.35%) 12,164.13
halfSeTaxDeduction 6,082.06
QBI 80,007.94
taxableIncomeBeforeQBI 63,907.94
tentativeQbiDeduction(20% of QBI) 16,001.59
taxableIncomeCap(20% of TI before QBI) 12,781.59
qbiDeductionAllowed 12,781.59
finalTaxableIncome 51,126.35
cap bites by 3,220.00

Gross receipts of $158,000.00 minus $34,000.00 in Cost of Goods Sold leaves $124,000.00 in gross profit; subtracting $37,910.00 in operating expenses leaves $86,090.00 in Schedule C net profit. Half the self-employment tax deduction ($6,082.06) brings QBI to $80,007.94 and taxable income before the QBI deduction to $63,907.94 — well under the $201,750 threshold, so neither the SSTB phase-out nor the wage/property cap is in play. A naive "20% of QBI" calculation would claim $16,001.59. But the 20%-of-taxable-income cap (§199A(e)(1), computed without adding back the QBI deduction itself, but after the standard deduction) is only $12,781.59 — with no other income to absorb the $16,100.00 standard deduction, it comes entirely out of the same base the cap is measured against. The allowed QBI deduction is $12,781.59, exactly $3,220.00 less than the naive figure. That gap isn't specific to this glazier: with no other income and no itemizing, the taxable-income cap always runs short of the naive 20%-of-QBI figure by precisely 20% of the standard deduction — the same $3,220.00 any single filer taking the $16,100.00 standard deduction would see, whatever their trade. Final taxable income: $51,126.35, which falls just above the top of the 2026 single 12% bracket ($12,400–$50,400, per Rev. Proc. 2025-32, §4.01) and into the 22% bracket ($50,400–$105,700) — a reminder that a materials-heavy trade with strong gross receipts can move a solo owner into a higher bracket even after every deduction above is applied.

Audit Triggers & Common Mistakes

1. Deducting the same glass twice. Running materials through both Line 22 supplies and Part III COGS in the same year — instead of picking one treatment per job — double-counts the deduction and is exactly the kind of internal inconsistency a reviewer catches on a quick read of the return.
2. Treating the glass cutting table or vacuum lifter system as a supply instead of equipment. A $6,000 lifter system expensed on Line 22 instead of Section 179'd on Line 13 stands out if the IRS cross-references your equipment against the insured-property schedule behind your Line 15 policy.
3. Skipping the July 1 mileage-rate split. A full year of delivery and install miles multiplied by a single annual rate — instead of split at July 1 between $0.725 and $0.76 — understates the deduction and looks like a guess rather than a real log.
4. Deducting a full year of liability or glass-breakage insurance when coverage lapsed mid-year. Only the months actually paid are deductible.
5. Misclassifying a helper as a 1099 contractor. A helper who works your schedule, uses your van, tools, and glass stock, and takes no other clients is a strong candidate for employee status under the IRS's common-law test — an easy audit trigger.
6. Claiming the naive "20% of QBI" figure instead of running the taxable-income cap. Skipping the cap overstates the deduction by an amount any CPA or examiner can recompute in a minute.

The defense in all six cases is the same: capture-at-the-job documentation. Photograph and tag each material and equipment receipt before it's lost in the van, log miles at the stop rather than reconstructing them later, and keep records for the period the IRS expects.

How CentSense Helps

CentSense tags every receipt and mileage entry to the right Schedule C line the moment you capture it — no separate spreadsheet for materials versus equipment, no reconstructed mileage log in April:

• Glass, glazing compound, and job materials tagged to COGS or Line 22 based on how you flag the job
• Glass cutting tables, lifters, and racks tagged as Section 179 equipment on Line 13
• Delivery and install miles logged automatically and split at the July 1 rate change
• Insurance premiums, bonding, and licensing tracked toward quarterly estimated taxes instead of arriving as a surprise

For closely related trades, see Flooring Installer & Tile Setter Tax Deductions, House Painter Tax Deductions, and Window Cleaning Business Tax Deductions.

Authoritative References

• IRS — About Schedule C (Form 1040)
• IRS — Publication 946, How To Depreciate Property (Section 179)
• IRS — Standard mileage rates updated for 2026 (Notice 2026-10, effective Jan 1)
• IRS — Internal Revenue Bulletin 2026-29 (Announcement 2026-11, mid-year mileage rate revision effective July 1)
• IRS — Internal Revenue Bulletin 2025-45 (Rev. Proc. 2025-32, §4: 2026 inflation adjustments incl. §199A thresholds, Section 179 limit, and standard deduction)
• 26 U.S.C. §199A — Qualified Business Income (Cornell Law School Legal Information Institute)

Stop guessing whether that pallet of glass is a supply or Cost of Goods Sold. Start a free CentSense account, scan each receipt with AI the moment you buy it, log delivery miles automatically at the correct half-year rate, and export a CPA-ready Schedule C breakdown at tax time. Free tier includes 10 AI scans per month.

This guide is general education for U.S. self-employed glazier and glass installation businesses filing a Schedule C in 2026. It is not personalized tax advice — your facts determine the right treatment. Consult a CPA or EA for your situation.