The convenience of the employer rule, explained

Almost every state residency and sourcing question resolves to the same underlying fact: where the person physically was. The convenience of the employer rule is the significant exception, and it is the reason a day counter built purely on location will misreport certain taxpayers by a wide margin.

Under the rule, a nonresident assigned to an employer’s office in the state is taxed on days worked elsewhere, unless the work was performed away from that office out of the employer’s necessity rather than the employee’s convenience. The employee may have been a thousand miles away all year. The state still treats the day as worked within its borders.

A different data model

Ordinary nonresident sourcing asks where you stood. The convenience rule asks where your job is assigned, then attributes the workday to that place regardless of your feet.

Two consequences follow that matter for anyone keeping records.

The unit of measurement changes. What is being counted is not presence days but workdays, and workdays are a smaller and differently defined set: weekends, holidays, sick leave and vacation come out of the denominator. A year is not made of calendar days for this purpose.

And each workday carries an attribute that no location log holds — the reason it was worked where it was. A day at home in Florida for a New York-assigned employee is a New York workday by default and a Florida workday only if the necessity standard is met. Location data cannot distinguish those two days; they look identical.

Where it applies

New York operates the most consequential version, set out in TSB-M-06(5)I. Delaware, Nebraska and Pennsylvania apply versions of their own. Connecticut and New Jersey apply reciprocal forms, generally reaching only residents of states that impose a convenience rule themselves — New Jersey adopted its version in 2023, explicitly as a counterweight to New York’s treatment of New Jersey residents.

The picture is not static. Nebraska narrowed its rule in 2024 by adding a presence condition, so it now bites only where the nonresident spends more than a handful of days in the state during the year. Other states have been reported at various times as applying convenience-style positions through administrative practice rather than statute. This is an area where the current departmental guidance is the only safe reference, and where a list written even two years ago may mislead.

The remote-work problem

Before the remote-work shift the rule affected a narrow population: the occasional consultant, the employee with an informal home-working arrangement. Afterwards it reached a very large number of people who had made a permanent move on the reasonable assumption that leaving the state ended their obligation to it.

The pattern recurs. An employee moves from New York to Florida, keeps the same job and the same New York-assigned role, and files a Florida-resident, no-tax year. New York’s position is that the remote days remain New York workdays, because the relocation suited the employee. The employer’s withholding may or may not have followed the move, which is a separate question from what is actually owed.

For a New York statutory residency analysis the physical days still matter in the ordinary way, counted on a part-day basis against a threshold of more than 183 days alongside the permanent place of abode limb. But the convenience rule runs independently of that count. You can be comfortably a nonresident on days and still be taxed on a full year of workdays.

The double taxation risk

The mechanism for avoiding the same income being taxed twice is the resident credit: your home state credits tax paid to another state on income sourced there. It works when both states agree on where the income arose.

The convenience rule is precisely the case where they do not. The home state looks at a day worked at a desk within its own borders and sources it to itself. The office state looks at the same day and sources it to the employer’s location. Where the home state grants credits only for income it regards as sourced elsewhere, it can decline the credit, and the taxpayer bears both.

New Jersey and Connecticut have each taken steps to relieve their own residents caught by New York’s rule, and the point has been litigated repeatedly without producing a settled national answer. Treat a mismatch as a live risk to be modelled, not a technicality that will resolve itself in the filing.

What records help

The claim you may need to support is that particular days were worked away from the assigned office out of the employer’s necessity. That is a documentary claim, and it is made per day.

Useful material includes a contemporaneous log of where each workday was performed and what the day consisted of; the employment contract and any written statement of assigned work location; evidence bearing on the bona fide employer office factors — a lease or licence for the remote space, employer payment or reimbursement of its costs, business conducted with clients there, specialised equipment the employer required; correspondence establishing that the arrangement was required rather than permitted; and travel records for days actually spent at the assigned office, since those are unambiguous either way.

The one thing that does not help is a general company remote-work policy. Permission is not necessity, and the distinction is the whole rule.

What Residay tracks

Residay records where each day was spent, with the evidence behind it, which supplies the physical half of the picture: the days genuinely spent in the office state, and the days genuinely spent elsewhere. It tracks state-level presence for California, Florida, Nevada, Tennessee, Texas and Washington as advisory presence evidence, and computes the determinative New York State and City counts.

What it cannot infer is the attribute the convenience rule turns on. Whether a day away from the assigned office was necessity or convenience is a characterisation of an employment arrangement, not an observation about location, and it belongs with the contract and the correspondence rather than with the ledger. The ledger’s job is to establish that the day happened where you say it did, so that the argument about why is not also an argument about whether.

Planning notes

• Establish where your work is assigned, in writing, before assuming a move has changed anything. Assignment is the trigger, not residence.
• Count workdays, not calendar days, and keep the denominator as carefully as the numerator.
• Model the resident credit explicitly rather than assuming it. Where the two states disagree on sourcing, the credit is the thing that fails.
• Where a genuine business reason keeps you out of the office state, paper it at the time. A necessity argument constructed after a notice arrives is a much weaker one.
• Verify each state’s current position directly. Convenience rules have been amended, narrowed and reciprocated repeatedly, and this is not a settled area.