Consulting invoice template for hourly and per-call work

A consulting invoice template needs your name and contact details, the client's legal name and billing contact, a unique invoice number, the issue date and due date, one line per call or block of hours with its date, rate and amount, the total, how to pay you and the payment terms. Copy the plain-text template below, fill it in, and send it as a PDF the day the work ends. If you take calls through an expert network, you will probably not send an invoice at all, because the networks covered below pay through their own portals.

This post is for consultants and experts paid by the hour or per call. The contract that sits behind the invoice is covered in consulting agreement, retainer agreement and statement of work template, and the taxes on what you collect are in 1099 consulting taxes.

1. Copy this consulting invoice template

Here is a made-up example, filled in for an independent supply chain expert named Tomas Reyes who billed a direct client for two calls and a written summary in October 2026. Replace every bracket and every example value with your own.

INVOICE

From:          Tomas Reyes Advisory LLC
               [Mailing address]
               [Email] | [Phone]

Bill to:       Northfield Capital Partners LP
               Attn: Accounts Payable
               [Accounts payable email]
               [Client mailing address]

Invoice no.:   2026-014
Issue date:    October 20, 2026
Due date:      November 4, 2026 (Net 15)
Client ref.:   PO 88213 / Warehouse automation project

DATE         DESCRIPTION                                  QTY      RATE     AMOUNT
2026-10-06   Call with J. Lee: automation vendors         1.0 hr   $400     $400.00
2026-10-13   Follow-up call: labor cost questions         0.5 hr   $400     $200.00
2026-10-14   Written summary of vendor shortlist          1.5 hr   $400     $600.00

                                                       Subtotal           $1,200.00
                                                       Expenses               $0.00
                                                       TOTAL DUE          $1,200.00

How to pay:    ACH transfer to the bank account on your vendor
               record for Tomas Reyes Advisory LLC. If you receive
               new bank details by email, call [phone] to confirm
               before paying.

Terms:         Due within 15 days of the issue date, per our
               consulting agreement dated [date]. Late balances
               accrue [rate] per month from the due date, as set
               out in that agreement.

Tax form:      Form W-9 sent separately on [date].

Questions:     [Email] | [Phone]

Every number above is invented. The fields are what to keep.

2. Fill in each field so accounts payable can pay without writing back

Write each field for the person in accounts payable who has never heard of you. Every question they have to ask you adds days.

From. Use the same business name that appears on your W-9 and your bank account. A mismatch can hold up payment; Third Bridge's expert terms (clause 7.5) reserve the right not to pay when your bank account details do not match the name on your account.
Bill to. Use the client's legal entity name, which is often different from the brand. Ask your contact for it, along with the billing email, before the first invoice.
Invoice number. Give every invoice a unique number and never reuse one. A year plus a sequence (2026-014) sorts well and shows nothing awkward about how many clients you have.
Issue date and due date. Print both. "Net 15" alone makes the reader do arithmetic, and some will not.
Client reference. Ask whether the client needs a purchase order number or project code on the invoice. Some companies route invoices by that number, and an invoice without it can sit unmatched.
Line items. Give each call its own line with the date, a short topic and the duration in the billing increment your agreement uses. For a flat fee per call, write "1 call" in the quantity column and the fee as the rate. Keep topics vague enough that the invoice reveals nothing confidential.
Expenses. List only expenses the client approved in advance, and attach receipts.
How to pay. Name one method. Tell the client to confirm any change of bank details by phone, because forged "new bank details" emails are a known way to redirect a payment to the wrong account.
Terms. Repeat the due date and late fee from your agreement. The invoice reminds; the agreement binds.

Keep a copy of every invoice you send. The IRS lists invoices among the supporting documents for gross receipts, and its general rule is to keep records for 3 years, with longer periods in some cases.

3. Use Net 15 by default, and accept Net 30 only if the agreement says so

Our recommendation is Net 15, meaning payment is due 15 days after the invoice date, agreed in your contract before the work starts. If a client insists on Net 30, accept it in the agreement rather than fighting it on every invoice.

Put the terms in the agreement, not only on the invoice. Payment terms the client first sees on a bill are much weaker than terms it signed.

Some places set a deadline for you if you do not. New York City's Freelance Isn't Free Act, explained on the city's freelance worker rights page, says contracts worth $800 or more, counting all agreements with the same client in any 120-day period, must be in writing, and that if a contract has no payment date the client must pay within 30 days after you complete the work. California's Freelance Worker Protection Act works the same way: the bill author's announcement of the signed law says it covers freelancers doing over $250 of work for a client over four months and that clients must pay within 30 days of completion unless the contract says otherwise.

Short version: write Net 15 into the agreement, print the actual due date on the invoice, and know that for clients covered by the New York City or California law, the law fills in 30 days if you forget.

4. Charge a late fee only if the agreement allows it, and check your state's limits

Add a late fee only when your signed agreement already says what it is. A fee that appears for the first time on an overdue invoice is hard to collect and easy to argue about.

How high it can go depends on state law. Cornell's Legal Information Institute defines usury as interest above "the lawful ceiling" and notes that it is usually defined and enforced by state statutes. States treat late charges, interest and penalties differently, so ask a lawyer in your state to check the clause once, then reuse it.

In the made-up example, Tomas's agreement charges 1% a month on balances past the due date. That number is an illustration, not a recommendation for your state. The fee's job is to move your invoice up the payment queue, not to earn you interest.

Send a Form W-9 to each US client once, by the client's vendor portal or another secure channel, and leave tax numbers off the invoice itself. The IRS says the W-9 gives your taxpayer identification number to the person who is required to file an information return with the IRS, and the form itself says "Give form to the requester. Do not send to the IRS."

Get a free employer identification number (EIN) and use it instead of your Social Security number. The W-9 says a sole proprietor with an EIN "may enter either your SSN or EIN," and the IRS says you never have to pay a fee for an EIN. An EIN on twenty clients' vendor files is better than your SSN on twenty clients' vendor files.

Do not skip the W-9. If you do not give a payer a correct taxpayer number, the IRS says the payer may begin backup withholding at 24% of future payments.

Two 1099 facts affect what you will see in January. The IRS instructions for Forms 1099-MISC and 1099-NEC set the 2026 threshold for reporting nonemployee compensation at $2,000, with forms due to you by January 31, and say payments made by card or through a third-party payment network are reported on Form 1099-K instead. Either way the income is yours to report; 1099 consulting taxes covers the rest.

6. Expert networks pay through their own portals, so log the call there instead of invoicing

If an expert network booked the call, do not send it an invoice. The networks below publish their own payment process, and it runs through their systems.

Network	How you get paid, in its own words
Third Bridge	You confirm the consultation within two business days and apply for payment in its web-based application (clause 7.1). Payment is made within 30 days of the later of a valid application and the client's confirmation (7.2). Third Bridge issues self-billed invoices, and experts agree not to raise their own (7.6, 7.7). If you are not paid in full, you must tell it by email within six months after that 30-day period (7.3).
Tegus	Payments go through Tipalti and are "processed within 15 business days of your call." Pay is prorated and rounded up to the nearest 15 minutes. The page says experts who earn more than $600 from Tegus in a year receive a 1099-NEC.
GLG	You set an hourly rate, and "once the project is completed, you'll receive payment based on your set rate."

Keep your own log anyway, with the same fields as the invoice template: date, network, project code, minutes, your rate, expected amount and the date paid. That log is your invoice register for portal work, and it is how you notice a payment that never arrived before a deadline like Third Bridge's six months runs out. Dialectica expert pay covers one more network's payment terms.

Tegus's page still gives $600 as the point at which it sends a 1099-NEC. That was the old IRS rule: the IRS Form 1099-NEC FAQ says the threshold is $600 for payments made through December 31, 2025 and $2,000 for payments made after that. So for calls paid in 2026, a payer has to send you a 1099-NEC only once it has paid you $2,000 or more in the year. Report all of the income either way, form or no form.

7. Chase a late payment on a schedule, and put each step in writing

Follow up on a fixed schedule so you never have to decide whether it is "too soon." Here is the one we suggest, counted from the due date:

Day 1. Send a short note with the invoice attached again.
Day 7. Call or message accounts payable and ask what is blocking payment. The answer is often a missing W-9, purchase order or vendor setup form, and you can fix it the same day.
Day 15. Send a second note that names the late fee from your agreement, if you have one, and pause new work for that client.
Day 30. Send a final written notice with a date by which you will file a claim.

A first reminder can be this short:

Subject: Invoice 2026-014, due November 4

Hi [name], invoice 2026-014 for $1,200.00 was due on November 4
and I have not seen payment yet. I have attached it again. If
anything is missing on your side (a W-9, a PO number, vendor
setup), tell me and I will send it today.

Thanks,
Tomas

Late payment is common enough to plan for. Go Fractional's 2026 State of Fractional Work report, from a marketplace that sells fractional talent, lists "client payment delays and lack of payment-terms enforcement" among the most common legal pain points its survey respondents named.

If the deadline passes, small claims court is built for invoice-sized disputes. In California, the courts' small claims guide says individuals can generally sue for up to $12,500 and businesses up to $6,250, and that you cannot have a lawyer represent you in court. Freelance laws add weight: New York City's freelance worker page says a freelancer who is not paid on time has a right to collect double the unpaid amount, and the California bill announcement describes damages of double the payment specified in the contract. If one of these laws applies, name it in your day 30 notice.

Where Instant Expert fits

Some paid work comes with the price settled before you say yes. On Instant Expert, a buyer invites you to a specific paid call or a written or voice answer and sets the amount up front. You receive the full amount offered, and you can reply with a higher price. You can claim your profile or see open paid requests on the request board.

Today, paste the template into a document, give it your next invoice number, and send a W-9 to any client that does not have one yet.