How to set a digital marketing budget for a small business

Updated 3 November 2026 · 4 min read

There is no correct figure for a small business marketing budget. There is, though, a sensible way to work out what yours should be, where it should go and how to tell whether it is paying for itself.

Many small businesses never set a marketing budget at all. Money gets spent when an advertising salesperson calls, when a quiet month causes panic, or when a supplier offers a deal. A budget turns that into a decision, made in advance, that you can review.

Start with the costs you cannot avoid

Some digital costs are simply the cost of being in business online. List them first:

Check each one against your bank statements. Small subscriptions add up, and unused tools are an easy saving.

Count your time

For most owner-run businesses, the biggest marketing cost is not money, it is time: writing posts, taking photos, answering messages, updating the website. Estimate how many hours a week go on marketing now, and how many you can realistically give it. If the honest answer is "very few", it may be better to pay for some help with specific tasks than to spread yourself thinly.

Decide what the budget needs to achieve

Budgets follow goals. Be specific about what you need: a certain number of new bookings a month, more online orders, filling a quiet day of the week, launching a new service. Then work back:

1. What is a new customer worth to you, over a year or over the time they typically stay?
2. How many new customers do you need?
3. What could you reasonably spend to win each one and still make money?

That gives you a ceiling for acquisition spending that is grounded in your own numbers rather than a rule of thumb.

Where the money can go

Free or nearly free

• A complete, active Google Business Profile.
• Organic social media, following a simple plan.
• An email list, which costs little until it grows.
• Asking happy customers for reviews.

Get these right before spending on advertising. They are the foundations paid campaigns build on.

Paid advertising

Search advertising (such as Google Ads) reaches people who are actively looking for what you sell. Social advertising (such as Meta ads) reaches people based on location, interests and behaviour, and suits building awareness or promoting an offer. Both can be run on small budgets, and both can waste money quickly without clear goals and tracking.

One-off projects

A new website, an online shop, a booking system or professional photography are investments rather than running costs. Budget for them separately, and check whether support is available: the Trading Online Voucher has generally covered up to half the eligible cost of projects that help small businesses trade online, up to a cap.

Outside help

If you pay a freelancer or agency, be clear about what you are buying: specific deliverables, how results will be reported, and who owns the accounts, website and content. Keep ownership of your ad accounts, domain, website and social profiles in the business's name.

Test small, then scale what works

For anything new, especially advertising, set a small test budget and a fixed period, such as a month. Decide in advance what success looks like: a number of enquiries, bookings or sales. At the end, keep, adjust or stop. Increase spending only on what has shown results.

Track the results

You cannot judge a budget without knowing where customers come from. Simple ways to track include:

• Asking new customers how they heard about you, and noting the answer.
• Tracked links (with UTM tags) in emails, social posts and ads, so your website analytics shows which ones bring visitors.
• Separate offer codes for different channels.
• The call, direction and website click reports in your Google Business Profile.

Plan around your year

Most businesses have busy and quiet seasons. Spend where it helps most: often in the weeks before a busy period, or to lift a predictable quiet spell. In Ireland, that might mean planning ahead for Christmas, the summer tourist season, back to school or January. Write those dates into your plan at the start of the year.

A simple budget template

1. List fixed digital costs for the year.
2. List one-off projects and any grant support you will apply for.
3. Set a monthly test budget for advertising, tied to one clear goal.
4. Estimate the hours you will give to marketing each week.
5. Review every quarter: what did each channel bring in, and what will you change?