Should I vibe code
Payroll, tax filing and benefits for small teams
Your agent can build payroll. It cannot file your 941, and the IRS does not accept pull requests.
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No entry on canivibecodeit.com — the verdict, the price and the score here are ours.
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Our verdict, the regret score and everything below it. Editorial and unsponsored — nobody can pay to be moved.
The honest answer
why the verdict is what it is
An agent will write you a payroll app in a weekend, and every part of it that matters is the part it cannot write. Payroll is not a CRUD app with a currency column — it is federal, state and local tax tables that change quarterly, filing deadlines with penalties attached, garnishment orders, multi-state withholding for the one employee who moved, and a legal obligation to pay exactly the right amount on exactly the right day to a person who has rent due. The software is the easy half. The compliance surface is a subscription you are paying for whether you build it or not, except when you build it the subscription is your own attention, forever, and the late-filing penalty is yours too.
What actually breaks
not "if". the specific failures.
- Tax tables go stale. Rates change quarterly and nothing tells you — the first signal is an underpayment notice months later.
- Multi-state withholding, the moment one person moves. Two states now want a cut and the rules for splitting it are not symmetric.
- Filing deadlines. 941 quarterly, 940 annually, state equivalents on their own calendars, each with its own penalty schedule.
- Garnishments and support orders arrive as legal instruments with priority rules you are required to honour in a specific order.
- Direct deposit reversals. Paying the wrong amount is not a database fix — the money has moved and clawing it back has its own legal process.
It is the 15th. Direct deposit ran last night against a stale state rate, so eleven people were underpaid by about $40 each and one was overpaid by $2,300. The underpaid ones have noticed. You cannot simply re-run it: the ACH batch has settled, the overpayment needs a written agreement to recover, and your filing for the quarter now reports numbers that do not match what you actually paid. Your options are to hand-correct twelve pay stubs before anyone's rent clears, or to explain to your team why payroll is a side project.
Is that you?
the verdict is a default, not a law
- It reads payroll data your provider already filed and produces reports for you
- It models take-home pay as an estimate, clearly labelled, and files nothing
- Everyone it covers is a contractor you invoice, with no withholding anywhere in scope
- You have employees. Not contractors you invoice — employees, with withholding.
- You operate in more than one state, or ever might.
- Nobody on the team wants to own tax-table maintenance as a standing quarterly commitment.
If you build it anyway
the checklist, then the prompt that enforces it
- Don't. This is the one category where the honest guardrail is a vendor.
- If you are building payroll *reporting* on top of a real payroll provider, that is a different and reasonable project — read-only, no money movement, no filing obligation.
- If you are determined anyway: never compute a tax rate yourself, use a filing API that carries the liability, and keep an immutable ledger of every calculation with the rate table version that produced it.
I am building payroll-adjacent software. Before you write any code, treat this as a compliance project that happens to need a database: 1. Enumerate every obligation the feature touches — withholding calculation, federal and state filing, deposit schedules, garnishment priority order, multi-state allocation, record retention. For each one, state plainly whether my design takes the obligation on or delegates it to a provider that carries the liability. 2. Refuse to compute a tax rate from a table you write into the codebase. If a rate is needed, it comes from a filing API, versioned, with the version recorded next to every number it produced. 3. If any money reaches a person, build the immutable audit ledger and the documented reversal procedure BEFORE the happy path. Every calculation stores its inputs, its rate-table version, and who approved the run. 4. Payroll runs are two-phase: a preview that reconciles against the previous period and flags any per-person delta over a threshold I set, then an explicit confirmation. Never a single endpoint that pays everyone. 5. Treat an ACH batch as settled and irreversible once submitted. There is no delete. Corrections are new, signed, logged transactions. 6. Multi-state is not a later feature. If the schema cannot represent one employee with withholding split across two jurisdictions, say so now rather than after someone moves. 7. Store year-to-date totals per employee per tax jurisdiction as first-class data, not as a sum over a payments table — this is what a migration to a real provider exports, and reconstructing it later is a project. 8. In the README, write a section headed 'Obligations I have taken on' listing every filing deadline, its penalty for lateness, and who on my team is accountable for it. If that list is longer than three items, tell me to buy this instead.
Or don’t build it
the boring option, and the way back out
Always. $46/mo against one late-filing penalty is not a comparison, and the vendor employs people whose entire job is the quarterly rate change you will forget.
$46/mo is cheaper than your weekend.
Run one full parallel cycle against a real provider before cutting over, and keep it running for two quarters. Migration means exporting year-to-date totals per employee per tax jurisdiction — if your schema does not already store that breakdown, the export is a reconstruction project rather than a query.
Open-source payroll engine; instructive on exactly how much of this is tax logic rather than software.
Questions
Why isn't this on canivibecodeit?
Their question is whether an AI agent can build a replacement. For payroll the answer is uninteresting — it can build the app and none of the compliance — so it falls outside what they catalogue. Ours is the question that survives that: given you could, should you. Some of the highest-regret things on this index are things they would never list.
What about contractors only, no employees?
Materially different and much closer to reasonable. No withholding, no 941, no multi-state allocation — you are issuing payments and generating 1099s. Still money movement, still a filing obligation, but the compliance surface is a fraction of the size.
- IRS Publication 15 (Circular E), Employer's Tax Guide
- IRS Form 941 — Employer's Quarterly Federal Tax Return, instructions
- U.S. Department of Labor — Wage garnishment, Title III of the CCPA
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last reviewed 2026-08-03 · verdict is editorial and unsponsored · shared entry data from canivibecodeit under MIT · not legal advice