Should agencies charge interest on unpaid media spend?

You can, but the better answer is to stop fronting it. Interest at 1.5% a month does not compensate for the risk of carrying six figures of someone else's ad spend, and it does nothing if the client fails. Move the client onto direct platform billing or prepayment instead.

What late fee do agencies typically charge?

1.5% per month on overdue fees is the norm, matching wider professional services practice. Agencies that front costs often apply tighter terms to the pass-through portion — net 7 or prepaid — while keeping net 30 on fees.

Can I pause a campaign if the client has not paid?

If your agreement allows suspension for non-payment, yes, and it is the most effective lever an agency has. Give written notice, be specific about what stops, and apply it consistently. Never pause without the contractual right — the resulting performance drop could otherwise expose you to a claim.

How do I stop over-servicing from hiding a payment problem?

Track hours against retainer value every month and review any account over 110%. Over-servicing masks the true cost of a client, so a late-paying account that also consumes 40% more time than it pays for can look merely inconvenient when it is actually unprofitable.

What terms should a new agency client start on?

Prepaid media, a deposit on production, and net 14 on fees for the first two or three months. Extend to net 30 once a payment history exists. Starting tight and relaxing later is straightforward; tightening terms after a client has grown used to paying late is a negotiation you will usually lose.

Late Fee Calculator for Agencies

Agencies carry a risk most service businesses do not: pass-through costs. When you front a client's ad spend, print run or influencer fees, a late invoice does not just delay your profit — it means you have lent the client money at your own expense, often on a card, and the platform will not wait for the client to pay you.

Use the calculator for the interest on your fees. Then treat the pass-through portion as a separate and more urgent problem, because that is where a single late-paying client can genuinely threaten an otherwise healthy agency.

Overdue amount

Currency

Days past due

Grace period (days)

Days your terms allow before fees start.

Fee type

Rate

1.5% per month is the common business default.

Compound the interestOnly tick this if your contract says fees accrue on unpaid fees. Simple interest is the commercial norm.

Late fee

$360.00

Accrued over 30 chargeable days.

Original balance: $24,000.00
Total now due: $24,360.00
Cost per additional day: $12.00
Effective annual rate: 18%

Late fees are only enforceable if they appear in terms your client agreed to, and maximum rates are capped by local usury law. This is an estimate, not legal advice.

Starting values are set for a typical agencies scenario — change any field to match yours. Need the plain version? Invoice Late Fee Calculator.

Why fronting media spend is the real exposure

An agency billing $30,000 a month in fees might be passing through $120,000 in media. If that client pays 45 days late, the agency is financing $180,000 of someone else's marketing. A 1.5% monthly fee on the whole balance recovers a fraction of the cost of carrying it on a credit card, and none of the risk if the client fails.

The fix is structural rather than punitive. Every option below removes some part of the exposure, and they can be combined.

Have the client pay the platform directly on their own billing account, with your agency holding access rather than liability. This eliminates the exposure entirely and is now common practice.
Collect media spend in advance, monthly, and bill fees separately in arrears. Spend is prepaid, fees carry the credit risk — and fees are the smaller number.
Set a hard cap on how much spend you will front for any one client, and stop campaigns at the cap regardless of the relationship.
Where you do front spend, price the financing in explicitly rather than hoping a late fee covers it.

Separate the two balances on your invoice

An invoice that merges fees and pass-through costs into one line is harder to chase and harder to reason about. Splitting them lets you apply different terms to each and makes the urgency legible to the client.

Suggested terms by line type
Line type	Terms	If overdue
Media / ad spend	Prepaid, or net 7	Pause campaigns immediately — this is not your money
Production pass-through	Net 14, deposit for large runs	Hold delivery of assets
Agency fees	Net 30, 1.5% monthly interest	Standard escalation ladder
Performance bonuses	Net 30 after reporting period	Low priority; chase with fees

Retainer hygiene

Bill retainers in advance, on the first of the month, not in arrears. This is the single highest-impact change most agencies can make.
Do not let a retainer auto-renew while the previous period is unpaid.
Reconcile over-servicing monthly. An agency that quietly absorbs 30% more hours than the retainer covers has a pricing problem that no late fee will fix.
Put a suspension clause in the master services agreement and use it. Pausing reporting and optimisation is noticed far faster than an interest charge.
Review any client whose average days-to-pay exceeds 45. Persistent late payment usually signals either financial stress or a low internal priority on your work, and both are worth knowing about early.

Frequently asked questions

Should agencies charge interest on unpaid media spend?: You can, but the better answer is to stop fronting it. Interest at 1.5% a month does not compensate for the risk of carrying six figures of someone else's ad spend, and it does nothing if the client fails. Move the client onto direct platform billing or prepayment instead.
What late fee do agencies typically charge?: 1.5% per month on overdue fees is the norm, matching wider professional services practice. Agencies that front costs often apply tighter terms to the pass-through portion — net 7 or prepaid — while keeping net 30 on fees.
Can I pause a campaign if the client has not paid?: If your agreement allows suspension for non-payment, yes, and it is the most effective lever an agency has. Give written notice, be specific about what stops, and apply it consistently. Never pause without the contractual right — the resulting performance drop could otherwise expose you to a claim.
How do I stop over-servicing from hiding a payment problem?: Track hours against retainer value every month and review any account over 110%. Over-servicing masks the true cost of a client, so a late-paying account that also consumes 40% more time than it pays for can look merely inconvenient when it is actually unprofitable.
What terms should a new agency client start on?: Prepaid media, a deposit on production, and net 14 on fees for the first two or three months. Extend to net 30 once a payment history exists. Starting tight and relaxing later is straightforward; tightening terms after a client has grown used to paying late is a negotiation you will usually lose.