Retainer, project fee or performance fee: how should you pay a marketing agency?

What are the main ways to pay, and when does each suit?

Four models cover most agency billing. Every figure below is a vendor's own, published by a firm that sells marketing services.

• Retainer. A fixed monthly fee for continuing work such as SEO, content and ads. Clicks Geek says retainers suit continuing needs, and that if more than 60 percent of your marketing activity needs continuous optimization a retainer is likely to pay⁶. Socio Labs lists flat retainers at Rs 30,000 to 2,00,000 a month³.
• Project fee. A set price for a defined deliverable, such as a website, a campaign build or an audit. Clicks Geek says projects suit testing a new channel or validating an offer, and suggests a 60 to 90 day project as a trial before committing to a retainer⁶.
• Percentage of ad spend. Used for ad management. Socio Labs puts it at 10 to 20 percent of monthly spend³. upGrowth quotes 10 to 15 percent as typical and says percentage pricing works best at larger monthly ad budgets⁴.
• Performance or hybrid. A base fee plus a bonus tied to results. upGrowth lists bonuses of 10 to 20 percent of the base retainer, and describes pure revenue-share fees of 10 to 20 percent of net revenue as rare for full-service work⁴.

Should I pay on performance only?

A hybrid usually works better for both sides: the agency has a base to do the work, and you keep a reward tied to results. A pure performance fee only works when the result is measurable and traceable, such as sales you can attribute to the agency's work. Settle in writing what counts, how it is measured, who owns the data, and what happens if tracking breaks.

For AI SEO there is a further problem. No agency controls what an assistant writes, so tying fees to a placement is a poor fit. One agency checklist flags money-back guarantees tied to AI outcomes the agency cannot control⁷. See Can an agency guarantee we appear in ChatGPT?. Where you cannot pay for an outcome, pay for inputs and measurement, with review dates.

Whatever the metric, judge it on business results. In an Ask HN thread on whether a monthly SEO retainer was worth it, commenters advised measuring conversions rather than traffic or domain authority⁸.

Which contract terms protect me?

One contract guide, from an agency that sells marketing services, sets out advised positions. Treat them as a starting list, not a legal template.

• Term: start with six months and avoid 12. If you must accept 12, negotiate an out clause at month six¹.
• Notice: 30 days is standard, 60 acceptable and 90 aggressive¹. Clicks Geek similarly suggests exit clauses with 30 to 60 days' notice if performance falls short⁶.
• Pause and kill fees: remove any clause that charges the full retainer during a pause, and check what triggers an early-termination fee¹.
• Ownership: ad creative and copy become yours on delivery or at least on final payment, analytics and tracking are owned by you, and campaign structures are documented and transferable¹.
• Accounts: you hold admin access to your own platforms, such as Google Ads, Meta Business Manager and GA4, before work begins¹.
• Handoff: two to four weeks, agreed in writing, with documentation and account transfers¹.
• Scope changes: define a rate card or cap overage percentages, and treat anything not listed as out of scope¹.
• Reviews and reporting: hard KPIs with formal reviews at 60 and 90 days, and a fixed reporting schedule¹.
• Media budget: direct billing to your own accounts is the cleaner structure, with a flat fee or a clearly disclosed percentage and no hidden markups¹.

What about GST, invoices and legal review?

GST at 18 percent applies to digital marketing and advertising services, so ask whether a quote includes it. For overseas clients, export of services can be zero-rated when conditions such as payment in convertible foreign exchange are met⁹.

This is general information, not legal advice. Have a lawyer read the contract before you sign, especially the clauses on ownership of work and data, and remember that you stay responsible for the actions of whoever you hire⁵. For who owns code and creative files, see Who owns the code?.