1099 Preparation Checklist for Construction: The Year-End Playbook
The 1099 filing season runs from early January through the end of January for most construction companies — file 1099-NECs with the IRS and furnish recipient copies by January 31, and file 1099-MISCs with recipients by January 31 (IRS filing date varies). The workload is real: a mid-market construction company typically issues 1099s to 100-400 vendors and individuals, each with its own preparation requirements.
The companies that handle 1099 season well do almost none of their work in January. The work happens throughout the year — collecting W-9s at vendor onboarding, running TIN matching before first payments, tracking 1099-reportable totals per vendor as payments are made, and resolving discrepancies on the day they appear. January becomes a verification and filing exercise rather than a scramble to assemble the underlying data.
The IRS split 1099 reporting in 2020: Form 1099-NEC reports nonemployee compensation, and Form 1099-MISC reports most other payments. Construction companies typically file both, with 1099-NEC being the higher-volume form for subcontractor work.
1099 form assignments by payment type
- 1099-NEC ($600 threshold) — nonemployee compensation for services, which is most construction subcontractor work
- 1099-MISC ($600 threshold) — rent, prizes, awards, medical payments, other income
- 1099-MISC ($10 threshold) — royalties and broker payments in lieu of dividends
- 1099-K (reported by third-party settlement networks, not the payer) — payment card and third-party network transactions
- Form W-2 (employees, not 1099) — wages paid to actual employees
Several rules govern whether a specific payment needs 1099 reporting. Getting these right prevents both under-reporting (IRS penalties) and over-reporting (unnecessary paperwork and potential recipient confusion).
Core 1099 reporting rules
- Threshold — $600 or more in aggregate payments during the calendar year triggers 1099 reporting
- Service vs. goods — services trigger 1099; purchases of physical goods generally do not
- Corporate exemption — payments to C-corps and S-corps generally exempt, except attorneys (always reportable) and medical/healthcare payments
- Payment method — applies to checks and ACH; transactions paid via payment card are reported on 1099-K by the processor, not by the payer on 1099-NEC
- US person — payments to US persons on 1099; payments to foreign persons are different (1042-S)
- Attorney payments — always reportable regardless of entity type, with specific rules for gross proceeds payments
The practices that make January easy happen during the year. The core disciplines:
Year-round 1099 readiness practices
- W-9 collected at onboarding — no vendor activates without a signed W-9 on file
- TIN matching completed before first payment — IRS TIN Matching Program verifies name and TIN combination
- Entity type captured and flagged for 1099 status — corp exemption status determined at onboarding
- Each vendor's 1099-reportable total tracked in the AP system throughout the year
- Payment method tracked — card payments flagged for 1099-K handling; check and ACH remain on 1099-NEC/MISC
- Address on file current — 1099 forms are mailed to the vendor's address and must be deliverable
- Annual W-9 refresh for vendors with material activity — confirm information is current
December is the month to pre-close the 1099 data. Key activities:
December 1099 preparation activities
- Run a vendor list showing YTD 1099-reportable amounts
- Identify vendors above $600 threshold without a current W-9 on file — request immediately
- Verify entity type for each vendor at or near threshold — corp vs. non-corp classification
- Re-run TIN matching for vendors with pending or failed matches — resolve before year-end
- Review payment method assignments — which payments are 1099-NEC, which are 1099-MISC, which are 1099-K eligible
- Segregate payments to attorneys (always reportable) from other payments
- Identify any payments misclassified — corrections made in December instead of January
Every hour spent on pre-close in December saves three hours of scramble in January. The vendors who haven't provided W-9s by December 15 rarely provide them by January 25 — identifying them in December gives time to collect or begin backup withholding; identifying them in January leads to either missed filings or incorrect filings.
January work is the actual filing execution. Assuming the pre-close was done well, the activities are procedural:
January 1099 execution sequence
- Week 1 — generate 1099 forms for all qualifying recipients; review for completeness
- Week 2 — resolve any late-breaking issues (missing addresses, TIN mismatches, late W-9s)
- Week 3 — final quality review; submit recipient copies (mailed or electronic per recipient preference)
- By January 31 — 1099-NEC electronic filing with IRS; 1099-NEC and 1099-MISC recipient copies delivered
- Late February — 1099-MISC electronic filing with IRS deadline (if paper, end of February)
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Backup Withholding for Missing TINs
Vendors without a valid TIN (no W-9, failed TIN matching, unresolved B notice) must be subject to 24% backup withholding on reportable payments. If backup withholding should have applied during the year but didn't, the payer is liable for the withholding that wasn't collected. January is not the time to discover this — these situations should have been resolved when they arose, with backup withholding commenced on payments made after the TIN failure.
For the 1099 filing itself, backup withholding goes in the 'Federal income tax withheld' box. The recipient gets credit for the withholding on their own tax return, so the recipient isn't double-taxed — but the compliance trail matters for both sides.
The IRS has been steadily lowering the threshold for required electronic filing. For 2024 reporting forward, companies filing 10 or more information returns in aggregate must file electronically. For construction companies filing hundreds of 1099s, electronic filing is the only practical option.
Electronic filing happens through the IRS FIRE system (the legacy pathway) or the newer IRIS (Information Returns Intake System) platform. Most payroll and AP software has FIRE/IRIS integration built in, generating the required formats and submitting directly.
IRS penalties for 1099 errors are tiered and can add up quickly. Late filing, failure to furnish to recipient, or failure to file altogether each carry their own penalties. The amounts are indexed annually but as of recent years run roughly: $60 per form if corrected within 30 days; $130 if corrected within the year; $330 if late beyond that; $660 for intentional disregard.
For a company filing 200 forms with, say, 10 errors, a $130 penalty per error is $1,300. A company with 50 errors facing the intentional disregard rate could be looking at $33,000 in penalties. These are avoidable costs — the process to avoid them is the same as the process to do the filings correctly.
AP platforms that handle 1099 preparation track reportable amounts per vendor in real time throughout the year, flag threshold crossings, integrate W-9 status and TIN matching results, generate 1099 forms at year-end, and file electronically with the IRS directly. The automation is particularly valuable for construction companies with large vendor counts — the manual version of tracking each vendor's YTD reportable amount across multiple projects is exactly the kind of work that scales poorly and produces errors.
1099 season is a predictable annual compliance event that gets harder every year the underlying vendor master isn't maintained and easier every year it is. The difference between a smooth January and a scramble is the previous twelve months of vendor onboarding discipline. Collect W-9s at onboarding, run TIN matching before first payment, classify entities correctly, and track reportable amounts continuously — then January becomes execution rather than investigation. The filing itself is no harder than the preparation was; poor preparation just makes the filing nearly impossible.
Written by
Jordan Patel
Compliance & Legal
Former corporate counsel specializing in construction contracts and tax compliance. Writes about the documentation layer — COIs, W-8/W-9, certified payroll, notice-to-owner deadlines — and the legal backbone behind audit-ready AP.
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