An ad hoc payment is a one-time disbursement authorized outside your normal payroll or accounts payable cycle to cover a specific, immediate obligation. It doesn’t repeat, it isn’t scheduled, and once it clears the transaction is finished. Businesses use them for things a batch run can’t handle in time or wasn’t built to handle at all, and they come with their own set of approval, tax, and fraud rules that recurring payments don’t trigger.
Because each one is authorized individually rather than processed in a batch, an ad hoc payment is more flexible than a scheduled disbursement and also more exposed to error and fraud. That trade-off shapes almost every rule around how to handle one properly.
When Businesses Use Them
Spot bonuses are one of the most common triggers. When a manager wants to reward an employee for landing a client or finishing a project early, waiting weeks for the next bonus cycle defeats the purpose. Expense reimbursements work the same way: an employee who paid out of pocket for client dinner or emergency travel shouldn’t have to wait for the next payroll run.
Emergency repairs and surprise vendor invoices are another frequent driver. A burst pipe, a crashed server, or broken production equipment doesn’t wait for your Friday AP batch. The vendor needs payment now, and an ad hoc disbursement bridges the gap.
One-off consulting fees and single-project contractor payments also fit here. Hiring a cybersecurity firm for a one-time penetration test, paying a commission on an unusually large sale, or sending a referral fee to someone outside the company are all situations where adding the recipient to a recurring system makes no sense.
Final paychecks sometimes move through this channel as well. Federal law requires an employer to pay by the next regular payday, and many states impose shorter deadlines, with some requiring same-day payment when the employer initiates the separation.
How to Issue One
The process starts with collecting the right information, and skipping this step is where most problems begin. You need the recipient’s full legal name, their bank’s nine-digit routing number, and their account number if you’re sending funds electronically. For any payment to a non-employee, you also need a completed Form W-9 to capture their taxpayer identification number. Without it, you may be required to withhold 24 percent of the payment and send it to the IRS as backup withholding.1Internal Revenue Service. Backup Withholding
Next, pick the correct general ledger code for the expense. Coding a contractor payment to the wrong department budget creates reconciliation problems that far outweigh the few seconds it takes to look up the right code. Complete your company’s internal request form with the exact dollar amount, payment method, and business justification.
The request then moves through your approval chain. A manager or department head reviews it against the allocated budget, and for larger amounts, a second approver or finance team member signs off. After internal authorization, the payment is entered into your payroll portal, accounting software, or online banking system. Many organizations require dual authentication or a secondary digital signature at this stage before the funds actually move.
Payment Methods and Processing Times
Most ad hoc payments travel through one of three channels, each with its own combination of speed, cost, and risk.
- ACH transfer is the workhorse. Funds typically clear within one to three business days, with a large share now settling same-day. Costs are minimal, usually under a dollar per transaction for businesses with established banking relationships. 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 outgoing wire fees commonly run $15 to $30 or more depending on your bank. Wires are best reserved for large, time-sensitive payments where the cost is justified.
- Physical checks are the slowest option by a wide margin. You’re adding printing, postal delivery, and the recipient’s own deposit time. Stopping payment on a check already in the mail carries its own fee, typically $30 or more. Checks also carry the most fraud exposure because they display your routing and account numbers in plain text.
Your accounting system should track the transaction from pending through cleared. Once the payment settles, attach the confirmation number or digital receipt to the original request. That linkage matters at tax time and whenever an auditor asks questions.
Tax Reporting
If you pay a non-employee $2,000 or more during the calendar year for services performed for your business, you must report that amount on Form 1099-NEC. This 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. Miss a dozen contractors and multiply accordingly.
Collecting a W-9 before you send any payment is the single best habit to build. The W-9 gives you the recipient’s taxpayer identification number, which you need for the 1099-NEC. 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.5Internal Revenue Service. Instructions for the Requester of Form W-9 Collecting it upfront, before the check is cut or the ACH is sent, avoids that situation entirely.
Worker Misclassification Risk
Ad hoc payments to individuals who perform work carry a specific legal risk. If you pay someone as an independent contractor but the IRS decides they should have been classified 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 of evidence: behavioral control (do you dictate how and when the work gets done?), financial control (do you control how the worker is paid, whether expenses are reimbursed, and who provides tools?), and the type of relationship (is there a written contract, are benefits provided, is the work a key aspect of your business?).7Internal Revenue Service. Independent Contractor (Self-Employed) or Employee? No single factor is decisive, but the more control you exercise over how someone works, the more likely they’re an employee regardless of what you call them.
The consequences of getting this wrong are built into the tax code. If you misclassified someone but at least filed the required information returns like a 1099-NEC, your liability is reduced to 1.5 percent of wages for income tax withholding and 20 percent of the employee’s share of Social Security and Medicare taxes. 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 The practical takeaway: if you’re genuinely unsure about classification, file the 1099-NEC anyway. It cuts your exposure in half if the IRS later disagrees with you.
Fraud Prevention
Ad hoc payments are disproportionately targeted by fraudsters because they bypass the routine checks built into recurring systems. The most common attack is business email compromise, where criminals gain access to a company email account, monitor internal communications, and then 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
The usual pattern: a scammer compromises an email account, watches for an upcoming payment, then sends a message that looks like it’s from the vendor or an executive requesting a change to the bank account on file. The request often invokes urgency (“we switched banks, please update before Friday’s payment”). Because ad hoc payments already involve manual processes and sometimes unfamiliar recipients, they’re easier to exploit than a recurring payment with bank details that haven’t changed in years.10United States Secret Service. Understanding Business Email Compromise
Three controls cut this risk sharply. Separate the roles so the person who requests a payment isn’t the person who approves it, and neither is the person who executes it in the banking system. Verify any change to payment details by calling the recipient at a number you already have on file, not a number included in the email requesting the change. And if you’re issuing physical checks outside your normal cycle, use your bank’s positive pay service, which matches each check presented for payment against a list of checks you’ve actually issued and flags anything not on the list before it clears.
Record Retention
Every ad hoc payment should be documented with the original request, the business justification, the recipient’s W-9, and the payment confirmation. How long you keep those records depends on the type of payment.
The general rule is 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, so your records need to survive that long. If a return is fraudulent or was never filed, there’s no time limit. For any ad hoc payment that ran through payroll, like a final paycheck or 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
Attach the supporting documents to the original transaction in your accounting system at the time of payment, not later. Reconstructing the justification for a one-off disbursement from memory becomes nearly impossible once six months have passed.