How to Set Your Freelance Day Rate (And Invoice Confidently for It)

One of the most common questions from people going freelance is: what should I charge? Set your rate too low and you undermine your value, struggle to cover your costs, and attract clients who don't respect your time. Set it too high without confidence and you'll discount it away the moment a client pushes back.

This guide gives you a practical method for calculating a sustainable day rate, explains how to present it clearly on invoices, and helps you handle the conversations around raising rates with existing clients.

Why most freelancers undercharge

The instinct when going freelance is to set a rate that feels safe — low enough that clients will definitely say yes. The problem with this approach is that it creates a trap: you're busy but not profitable, you attract price-sensitive clients who are harder to work with, and raising rates later is far more uncomfortable than getting them right from the start.

A better approach is to calculate the rate you actually need — then test whether the market will bear it, rather than starting low and hoping to creep upward.

How to calculate your minimum viable day rate

Your day rate needs to cover four things: your personal living costs, your business costs, your tax bill, and a margin for savings, dry spells, and non-billable time. Work through each:

Step 1: Work out your annual personal cost

What do you need to take home each year to cover your rent or mortgage, food, bills, travel, and personal spending? Be honest — include everything, not just the basics. Add 10–15% as a buffer.

Step 2: Add your business costs

Software subscriptions, professional indemnity insurance, accountancy fees, equipment, training, marketing. Total these up annually.

Step 3: Calculate your tax liability

As a rough guide, add 25–30% on top of your total income target to cover Income Tax and National Insurance if you're a basic rate taxpayer (under £50,270 profit), or 35–40% if you're likely to be a higher rate taxpayer. Your accountant can give you a precise figure.

Step 4: Work out how many billable days you actually have

This is where most freelancers make a critical error — they assume they'll be billing every working day. In reality, you'll spend significant time on:

1. Business development, pitching, and admin — typically 20–30% of your time
2. Holidays — at least 20–25 days if you want a sustainable work-life balance
3. Sick days and personal time
4. Public holidays — 8 days in England

A realistic billable day count for most freelancers is around 180–220 days per year out of approximately 260 available working days.

Putting it together

This is your floor — the minimum you can charge and still cover your costs. Your actual rate should be at or above this, informed by market rates for your skill set and experience level.

Check what the market pays

Once you know your minimum, research what clients actually pay for your type of work. Sources include:

1. Job boards and freelance platforms — search for day rates on contracts similar to your work
2. Industry surveys — many professional associations publish annual rate benchmarking reports
3. Your network — ask other freelancers in your field what they charge, or what they know clients typically pay
4. Rate calculators — several exist for specific industries (IT contracting in particular has detailed rate data by skill and region)

If the market rate for your skill set is well above your minimum viable rate, don't leave money on the table by charging your minimum. If it's below your minimum, you have either a pricing conversation or a positioning problem to solve.

Day rate vs hourly rate vs project fee — which to use?

How to present your rate on an invoice

Be clear and specific on every invoice. Don't just put a lump sum — show your rate and the quantity so the client can verify the calculation:

1. Day rate: "Strategy consultancy — 4 days at £350/day — £1,400"
2. Hourly rate: "UX design — 12.5 hours at £85/hour — £1,062.50"
3. Project fee: "Brand identity design — project fee as agreed — £3,500"
4. Retainer: "Monthly content retainer — February 2026 — £1,200"

Clarity on the invoice reduces queries, builds trust, and makes it easier for clients to approve payment quickly.

How to raise your rates with existing clients

Raising rates is uncomfortable but necessary. Your costs go up, your skills develop, and a rate that felt right two years ago may now be significantly below market. A few principles that make it easier:

1. Give notice — typically one to three months — don't spring a rate increase on a client mid-project or with an invoice
2. Tell them, don't ask — "My day rate will increase to £X from [date]" is more professional than "I was wondering if it would be okay to charge a bit more"
3. Keep the explanation brief — you don't need to justify in detail. A single sentence referencing increased costs or market rates is sufficient
4. Raise rates with all clients at the same time — or at contract renewal points — rather than inconsistently
5. Don't apologise for it — a rate increase applied professionally is a normal part of any business relationship

A simple rate increase email:

"Hi [Name], I wanted to let you know that my day rate will increase to £[X] from [date], reflecting increased costs and updated market rates for my work. This will apply from [date], and existing work in progress will be completed at the current rate. Please let me know if you have any questions. Looking forward to continuing to work together."

Invoice confidently at your rate

Invoice Kwik makes it easy to set your rate once and apply it consistently to every invoice — whether you're charging a day rate, hourly, by project, or on retainer. No manual calculations, no inconsistency, no second-guessing.

Try Invoice Kwik free — no credit card required.