Credit Scores and Buying a Home on Tradesperson Income
Why this matters
A tech with a strong year of overtime and a side business can earn more than plenty of salaried buyers and still get a smaller pre-approval than they expected, or a "we need two years" from the loan officer. That is not the lender doubting your work. It is the lender reading income the way its rulebook tells it to, and that rulebook discounts exactly the pay that makes trade work lucrative: overtime, commission, spiffs, flat-rate swings, seasonal layoffs and 1099 side income. Techs who know how the underwriter will read their file can spend the year before applying building the file the lender will count, instead of finding out at the closing table.
This is general information on how mortgage underwriting typically works, not personal financial or lending advice. Programs and lender overlays vary; a loan officer reading your actual documents is the authority on your file.
Who writes the rules
Most U.S. mortgages are sold to or insured by a handful of programs, and each publishes an underwriting guide that lenders follow, often with their own stricter overlays on top:
- Conventional loans sold to Fannie Mae or Freddie Mac follow their selling guides.
- FHA loans follow HUD's single-family handbook (Handbook 4000.1).
- VA and USDA loans follow their own guides.
The income rules below are typical of those guides. The details move, and the credit scoring models lenders use are being updated as of 2026, so take any specific figure here to a loan officer as a question, not an answer.
How the lender reads each kind of pay
| Pay type | What the lender typically wants | How it gets counted |
|---|---|---|
| Base hourly or salary | Recent pay stubs, W-2s, a verification of employment | Current base, in full |
| Overtime, bonus, commission | Usually a two-year history; some guides allow 12 to 24 months with strong offsetting factors | Averaged over the history; if the trend is declining, the lender may use the lower recent figure or exclude it |
| Flat-rate or piece-rate | Treated like variable income: history, plus the employer confirming it is likely to continue | Averaged, same declining-trend rule |
| 1099 or side business | Usually two years of personal tax returns, sometimes business returns too | Net profit from the tax return, plus certain add-backs such as depreciation, never gross receipts |
| Seasonal work with layoffs | History of the seasonal pattern, often two years | Averaged across the year; some guides count unemployment benefits only when they follow a documented seasonal pattern |
| Cash side work not on a return | Nothing, because there is nothing to verify | Zero |
Three consequences surprise techs most.
The lender reads your tax return, not your invoices. If you ran a side business last year and wrote off every tool, truck mile and phone bill, your Schedule C net profit is what qualifies, and it may be a small fraction of what you collected. The deductions that saved you tax this April cost you qualifying income for a mortgage. See related: Side Work: The Tax, Insurance and Employer Risks.
A declining trend is read as the new normal. Two years of overtime averaged together sounds generous, but if this year is running below last year, the underwriter is told to ask why and may use only the lower figure.
Switching how you are paid resets the clock. Going from W-2 to 1099 in the same trade is often treated as new self-employment, with its own two-year history requirement. Moving to a new W-2 employer in the same line of work at similar pay is usually fine. Moving from hourly to commission can put the new variable portion back on a history clock.
The other half: debt-to-income
Lenders compare your monthly debt payments, including the new housing payment, against qualifying monthly income. This is the debt-to-income ratio (DTI). As a rough frame, conventional loans approved through automated underwriting can go up to about 50 percent, manually underwritten loans are typically held lower, and FHA has its own limits with room for strong compensating factors. Lenders also look at the housing ratio, the housing payment alone against income.
What counts as debt: car and truck loans, student loans, the minimum payment on every credit card, personal loans, child support, and the scheduled payment on a tool truck account. Many tool vendor accounts report to the credit bureaus; even one that does not shows up as a recurring withdrawal on the bank statements you hand over. A tool account with a weekly payment is converted to a monthly figure and counted like any other loan.
How the credit score is built
The score lenders pull summarizes your credit reports. The major scoring model's own published weights are roughly: payment history about 35 percent, amounts owed about 30 percent, length of history about 15 percent, new credit about 10 percent and credit mix about 10 percent. What that means in practice for a tech:
- One payment 30 or more days late on anything, including a tool account that reports, does more damage than almost anything else and stays on the report for years.
- Credit card utilization, the balance against the limit, moves the score month to month. Running a card near its limit to buy tools, even if you pay it off, can show a high balance on the statement date the lender sees.
- New accounts and hard inquiries cost a little and recover. Shopping several mortgage lenders within a short window is generally scored as one inquiry; opening a new truck loan or store card in the months before you apply is a different matter.
Pull all three of your reports free at AnnualCreditReport.com, the site federal law set up for it, and dispute any error with the bureau that shows it, well before you apply.
A worked file
A plumbing tech, W-2 hourly, applying for a conventional loan. All income and payments are written in units of M, one month of the tech's base pay, so the math works at any wage.
What the tech brings:
- Base pay: 1.00 M per month.
- Overtime: 3.0 M two years ago, 2.4 M last year, and 1.0 M in the first six months of this year.
- A side business started last year, one year of Schedule C: gross receipts 1.8 M, expenses 1.2 M, net profit 0.6 M, of which 0.1 M was depreciation.
- Monthly debts: pickup loan 0.12 M, tool truck account 0.07 M (weekly payments converted to monthly), credit card minimum 0.03 M, student loan 0.04 M. Total 0.26 M.
- Proposed housing payment (principal, interest, taxes, insurance): 0.32 M.
How the tech figured it: base 1.00 M, plus last year's overtime 2.4 M divided by 12, or 0.20 M, plus side gross 1.8 M divided by 12, or 0.15 M. Income 1.35 M. Debts plus housing are 0.26 M plus 0.32 M, or 0.58 M. DTI 0.58 divided by 1.35 is 43.0 percent. Comfortable.
How the underwriter figured it:
- Base: 1.00 M.
- Overtime: the two-year average is 3.0 plus 2.4, or 5.4 M, divided by 24 months, which is 0.225 M a month. But the trend is down: this year's 1.0 M in six months annualizes to 2.0 M, below last year's 2.4 M. The underwriter uses the lower current figure, 2.0 M divided by 12, which is 0.167 M.
- Side business: one year of history. Even counted, it would be net profit 0.6 M plus the 0.1 M depreciation add-back, or 0.7 M a year, not 1.8 M. With one year, this lender excludes it entirely.
- Qualifying income: 1.00 M plus 0.167 M, or 1.167 M.
- DTI: 0.58 divided by 1.167 is 49.7 percent, at the edge of what automated approval accepts. Housing ratio: 0.32 divided by 1.167 is 27.4 percent.
The tech's own number and the lender's differ by 6.7 points of DTI, and none of the gap is a mistake on the lender's part.
LOAN OFFICER: Your overtime's down this year. Why?
TECH: New dispatcher, she spreads the calls out.
LOAN OFFICER: So it's likely to stay at this level?
TECH: Probably, yeah.
LOAN OFFICER: Then I use this year's pace. The side
work I can't count till you file a second year.
TECH: What gets me under the line now?
LOAN OFFICER: Pay off the card and the tool account
before we submit. Don't open anything new.
The fix, run through the same math. Clearing the tool account (0.07 M) and the card minimum (0.03 M) takes 0.10 M off monthly debt. Debts plus housing fall to 0.48 M. DTI becomes 0.48 divided by 1.167, which is 41.1 percent. That is a stronger file than any income argument would have made, and it is the reason a debt payoff plan often matters more than a raise in the year before buying. See related: Paying Down Tool Truck and Card Debt.
What changes the answer. If the tech's overtime had been flat or rising, the underwriter would likely use the two-year average, 0.225 M, for qualifying income of 1.225 M and a DTI of 0.58 divided by 1.225, or 47.3 percent before any payoff. If the side business reaches two years of returns, its net (plus add-backs) can count, averaged, provided the second year is not lower than the first. And if paying off the tool account empties the savings the lender wants to see as reserves or down payment, the trade may not be worth it; ask the loan officer to run both.
The year before you apply
- Pull your reports now, fix errors, and set every account to autopay at least the minimum so no payment goes late.
- Hold your pay structure steady. Avoid moving from W-2 to 1099, or into a new pay plan, in the 12 to 24 months before applying if you can.
- File returns that reflect the side income you want counted. Every expense you deduct lowers qualifying income; that is a trade-off to make on purpose with a tax preparer, not by accident.
- Do not open new credit in the months before applying, including a new truck or a tool account.
- Document large deposits. Cash from side jobs dropped into the account in lump sums will be questioned; money with no paper trail generally cannot be used for the down payment.
- Ask early for a pre-approval review with your real stubs, W-2s and returns. A loan officer can tell you a year ahead which pay will count.
References
- Fannie Mae Selling Guide, income assessment sections (variable income, self-employment)
- HUD Handbook 4000.1, FHA Single Family Housing Policy Handbook
- myFICO, published score factor weights; AnnualCreditReport.com (free reports under the Fair Credit Reporting Act)
- See related: Paying Down Tool Truck and Card Debt, Side Work: The Tax, Insurance and Employer Risks, Going 1099: The Tax Math a Tech Misses, Building an Emergency Fund on Seasonal Income