---
title: "What is a Retainer?"
canonical: https://wavect.io/glossary/retainer/
language: en
description: "Recurring monthly engagement where the vendor reserves a defined capacity in exchange for a predictable fee."
image: "https://wavect.io/img/general/bak/open_graph_preview.jpg"
---

ENGAGEMENT

# Retainer

Recurring monthly engagement where the vendor reserves a defined capacity in exchange for a predictable fee.

Last reviewed: 2026-05-24 by [Kevin Riedl](/team/kevin-riedl/) [wiki ↗](https://www.wikidata.org/wiki/Q139796365)

A retainer is a subscription to a vendor’s time. You pay every month; in return you get a defined number of days or a defined team capacity. The exact scope shifts; the availability does not.

Retainers work well when the work is ongoing and the priorities change too fast for a [Statement of Work](/glossary/sow/) to keep up. Product teams use retainers for design partners, engineering teams use them for fractional senior roles, and almost every legal counsel arrangement is a retainer. In Austria a retainer is usually structured as a Dienstvertrag or freier Dienstvertrag, since what you are buying is reserved availability and judgement rather than a fixed work product.

The risk is the inverse of [T&M](/glossary/time-and-material/): the vendor gets paid even when there is no work. Smart customers attach a “reasonable use” clause and review the retainer quarterly to confirm capacity is being used. If utilisation is below 60%, the retainer is the wrong shape and you want a per-engagement SoW instead.

Worked example: a startup puts a senior advisor on a 10-day-a-month retainer “to be safe”. For two months it is fully used; then the launch ships and the work drops to two days a month, but the invoice does not. They are now paying for eight idle days. The fix is not to cancel the relationship, it is to right-size it: drop to a smaller retainer plus the option to scope a [fixed-price](/glossary/fixed-price/) build when a real deliverable appears. Healthy retainers sit at 70 to 85% utilisation; below that you are buying insurance, above 95% you are running the vendor as staff with no slack for the work that matters.

The honest trade-off is predictability versus efficiency. A retainer buys you a known monthly cost and a reserved senior brain, at the price of paying for capacity in the quiet months. Related: [Fractional CTO Austria](/services/fractional-cto/) runs a weekly [retainer](/glossary/fractional-cofounder/) you can cancel any week, which removes most of the lock-in that makes traditional retainers risky.

// FAQ

## FAQs

### Retainer or SoW?

Retainer when the priorities shift faster than you can write a scope. SoW when there is a clear deliverable. Most companies start with retainers because it feels flexible, then realise they are paying for capacity that goes unused. Audit utilisation every quarter.

### How do I know my retainer is the wrong shape?

If utilisation is below 60%, you are overpaying for availability you do not use. If it is above 95%, the vendor has no slack for the work that matters and you are running them as staff augmentation. Healthy retainers sit at 70 to 85%.

### Can I cancel a retainer mid-month?

Depends on the contract. Most retainers require 30 to 90 days notice; some carry a minimum-term clause. Wavect’s Fractional Co-Founder model is the outlier: cancel any week, no notice. Most of the industry is not that flexible.

Related terms

- [SoW](/glossary/sow/)
- [Time & Material](/glossary/time-and-material/)
- [Fixed-Price](/glossary/fixed-price/)
- [Fractional Co-Founder](/glossary/fractional-cofounder/)

Related services

- [Custom Software Development](/services/software-development/)

Related case studies

- [Bond Analytics Platform](/case-studies/bond-analytics/)

Related guides

- [Fixed price vs time and materials](/software-development-guide/fixed-price-vs-time-and-materials/)

Discussed in articles

- [Fixed price vs T&M: scope creep by the numbers](/blog/fixed-price-vs-tm-scope-creep-rates/)

Talk to us

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