An ad hoc payment is a one-time disbursement a business makes outside its normal payroll or accounts payable cycle to cover a specific, immediate obligation. It’s authorized on its own, sent on its own, and creates no recurring commitment. Once the money clears, the transaction is done.
That single-use nature is the whole point. A monthly lease, a biweekly paycheck, a quarterly premium — those are systematic and get processed in batches. An ad hoc payment is handled individually, reviewed on its own merits, and approved separately. That gives it flexibility the regular cycle can’t match, and also exposes it to errors and fraud the regular cycle would have caught.
When You’d Actually Send One
Spot bonuses and performance awards are among the most common triggers. If a manager wants to reward an employee for landing a major client, the company isn’t going to wait six weeks for the next bonus cycle. Expense reimbursements follow the same logic — an employee who paid out of pocket for emergency travel or a client dinner shouldn’t have to wait for the next payroll run to get made whole.
Emergency repairs and unexpected vendor invoices drive a lot of these payments too. A burst pipe, a crashed server, or a broken piece of production equipment doesn’t care about your payment schedule. The repair vendor needs payment now, and your regular accounts payable batch doesn’t run until Friday. An ad hoc disbursement bridges that gap.
One-off consulting fees and single-project contractor payments fit the same pattern. If you hire a cybersecurity firm for a one-time penetration test, there’s no reason to add them to a recurring system. You issue a single payment for the agreed amount when the work is done. The same goes for a commission on an unusually large sale or a referral fee paid to someone outside the company.
Final paychecks after a termination sometimes get handled this way, though the timing depends on state law. Federal law only requires that the final check be issued by the next regular payday. Many states impose shorter deadlines, and some require same-day payment when the employer initiates the separation.
How to Send an Ad Hoc Payment
Start by collecting the recipient’s information. You need their full legal name, their bank’s nine-digit routing number, and their account number for an electronic transfer. For any payment to a non-employee, you also need a completed Form W-9 to capture their taxpayer identification number. If the recipient refuses to provide one or gives you an incorrect number, you’re required to withhold 24 percent of the payment and remit it to the IRS as backup withholding.1Internal Revenue Service. Backup Withholding Collecting the W-9 before you cut the check avoids that entirely.
Next, code the expense to the correct general ledger account. Coding a contractor payment to the wrong department budget creates reconciliation headaches that far outweigh the time it takes to look up the right code. Complete your company’s internal request form with the exact amount, the payment method, and a written business justification.
The request then moves through your approval chain. A manager or department head reviews it against the allocated budget. For larger amounts, a second approver or finance team member signs off. After internal authorization, the payment gets entered into your payroll portal, accounting software, or online banking. Many organizations require dual authentication or a secondary digital signature before the funds actually move.
Choosing a Payment Method
Most ad hoc payments travel through one of three channels, each with a different mix of speed, cost, and risk.
ACH transfer is the workhorse. Funds typically clear within one to three business days, and a large share of ACH transactions now settle same-day. Per-transaction costs are usually under a dollar for a business with an established banking relationship. The downside: if you enter the wrong account number, you won’t find out for about two banking days, when the receiving bank returns the transaction as undeliverable.
Wire transfer is faster — domestic wires often settle the same business day — but significantly more expensive. Outgoing wire fees for business accounts commonly run $15 to $30 or more. Reserve wires for large, time-sensitive payments where the extra cost is justified.
Physical checks are the slowest option. You’re adding printing time, postal delivery, and the recipient’s own deposit processing. Stopping payment on a check already in the mail carries its own fee, typically $30 or more. Checks also create the most fraud exposure because they display your routing and account numbers in plain text on the face of the document.
Whatever method you use, your accounting system should track the transaction from pending to cleared, and the digital receipt or confirmation number should be attached to the original request file. That linkage matters at tax time and during audits.
Tax Reporting You Cannot Skip
If you pay a non-employee $2,000 or more during the calendar year for services performed for your business, you must report the total on Form 1099-NEC. The threshold increased from $600 to $2,000 for tax years beginning after 2025 and will be adjusted for inflation starting in 2027.2Internal Revenue Service. General Instructions for Certain Information Returns (2026)
The filing deadline for Form 1099-NEC is January 31 of the following year, whether you file on paper or electronically.3Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC Miss it and the penalties stack up fast: $60 per form up to 30 days late, $130 per form from 31 days late through August 1, $340 per form after August 1, and $680 per form if the IRS decides the failure was intentional.4Internal Revenue Service. Information Return Penalties Those are per-form amounts, so a dozen missed contractors multiply the damage.
Collecting a W-9 before you send any payment is the single best habit to build around these disbursements. It gives you the taxpayer identification number you need to file the 1099-NEC and keeps you out of the backup withholding rules if the recipient later goes quiet.5Internal Revenue Service. Instructions for the Requester of Form W-9
Contractor or Employee: Getting Classification Right
An ad hoc payment to an individual carries a specific legal risk. If you pay someone as an independent contractor but the IRS determines they should have been treated as an employee, you can be held liable for unpaid employment taxes including income tax withholding, Social Security, Medicare, and unemployment taxes.6Internal Revenue Service. Worker Classification 101 – Employee or Independent Contractor
The IRS looks at three categories: behavioral control (do you direct how and when the work gets done?), financial control (do you control how they’re paid, whether expenses get reimbursed, who provides tools?), and the type of relationship (is there a written contract, are benefits provided, is the work a key part of your business?).7Internal Revenue Service. Independent Contractor (Self-Employed) or Employee? No single factor decides it, but the more control you exercise, the more likely the person is an employee no matter what you call them.
One protective step: if you’re unsure about classification, file the 1099-NEC anyway. If you misclassify but did file the required information returns, your liability drops to 1.5 percent of wages for income tax withholding and 20 percent of the employee’s share of Social Security and Medicare. If you didn’t file the returns, those figures double to 3 percent and 40 percent.8Office of the Law Revision Counsel. 26 U.S. Code 3509 – Determination of Employer’s Liability for Certain Employment Taxes Filing the form cuts your exposure in half.
Fraud Controls Worth Building In
These payments are disproportionately targeted because they bypass the routine checks built into recurring payment systems. The most common attack is business email compromise: criminals get access to a company email account, watch internal communications, and inject themselves into a payment conversation with fraudulent bank details. The FBI reports that BEC schemes have generated over $55 billion in reported losses since tracking began.9Federal Bureau of Investigation. Business Email Compromise – The $55 Billion Scam
A typical attack: a scammer compromises an inbox, watches for an upcoming payment, then sends a message that looks like it’s from the vendor or an executive asking to update the bank account on file. The request usually invokes urgency, something like “we switched banks, please update before Friday’s payment.” Ad hoc payments already involve manual processes and unfamiliar recipients, so they’re easier to exploit than a recurring payment whose bank details haven’t changed in years.10United States Secret Service. Understanding Business Email Compromise
Three controls cut this risk sharply. Separate the roles: the person who requests a payment should not be the same person who approves it, and neither should be the person who executes it in the bank. Verify any change to payment details by calling the recipient at a phone number you already have on file, never a number included in the email requesting the change. And if you issue physical checks outside your normal cycle, use your bank’s positive pay service, which matches every check presented against a list of checks you’ve actually issued and flags anything that doesn’t match before it clears.
What to Keep in the Files
Every ad hoc payment should be documented with the original request form, the business justification, the recipient’s W-9, and the payment confirmation. The general rule is to keep those records three years from the date you file the tax return that includes the deduction. If you underreport gross income by more than 25 percent, the IRS has six years to audit. If a return is fraudulent or was never filed, there’s no time limit at all. For any ad hoc payment that ran through payroll — a final check, a bonus — keep records at least four years after the tax is due or paid, whichever is later.11Internal Revenue Service. Publication 583 – Starting a Business and Keeping Records
The practical move is to attach every supporting document to the transaction in your accounting system at the time of payment, not months later when someone asks. Reconstructing the justification for a one-off payment from memory is nearly impossible after six months. Two minutes at the time of disbursement saves hours during an audit.