How to Build a Case for Investment in a Digital Regular Giving Programme

By Nick Burne

The hardest part of growing regular giving through digital isn't the advertising. It's getting the budget to start in the first place.

We see it regularly. A digital fundraising team knows the opportunity is there, has seen the case studies, and can point to competitors acquiring monthly donors through Meta and Google. But the project goes to the Finance Director, comes back with questions about ROI (Return on Investment) and cost ratios, and dies quietly in a spreadsheet.

The problem is almost never that digital regular giving doesn't work. It's that the case is built in the language of fundraising - reach, engagement, ROAS - rather than the language of investment. Below is how to build a case for investment that will make your finance team happy. (Yes it is possible!)

1. Lead with payback period, not ROI

Lifetime value (LTV) is the number fundraisers love. But often finance people will not trust a metric that has so much of the benefit given in an uncertain future. So instead, the payback period is a number that gives finance staff more confidence they can act on.

Payback period is the number of months it takes for the cumulative net income from a cohort of new regular donors to cover the fully loaded cost of recruiting them. It matters because it answers the question your FD is actually asking: how long is our money tied up, and when can we reinvest it?

What should you aim for?

For a digital-first regular giving programme, we'd suggest the following as a working framework:

• Under 12 months - excellent. The programme is close to self-funding within a year. Each year's recruitment is largely paid for by the previous year's cohort, and you can scale without repeatedly going back to reserves.

• 12–18 months - the realistic target for most charities. This is where a well-run digital RG programme with a decent average gift and sound onboarding should land. It's still a strong number to take to a decision maker.

• 18–24 months - viable, but you need to be honest about it. You'll need genuine working capital and a credible retention assumption to invest here. Perfectly acceptable if the long-term value is strong (which with digital fundraising it usually is!), but don't promise it will feel comfortable in year one.

• Over 24 months - go back and look at the inputs. Usually one of three things is wrong: the average gift is too low, the CPA is inflated by weak creative or a poor donation journey, or you're counting leads that were never going to convert. This is where the honest truth we have found is that digital fundraising in this way is not going to be a good fit for every type of organisation. Here your digital strategy may need to move to more of an organic model (and that’s a good idea for a future blog post!)

Two rules before you quote a payback number

• Make the cost fully loaded. Include all the costs - Media spend, creative production, agency cost, donation platform fees, and payment processing. Everything other than core team costs since this exists already. If you use an external consultant like us then you’ll need to add that too. A payback figure built on media cost alone will be challenged the moment anyone looks closely - and rightly so.

• Make the income net, and show Gift Aid separately. UK charities should present two payback figures: cash payback, and payback including Gift Aid. Gift Aid typically adds around 20% to your effective monthly income once you account for the proportion of donors who declare it, and it can pull a 14-month payback under 12. It's real money, but show your working and you’ll impress your finance team. (Non-UK readers: substitute your local equivalent, or simply drop the uplift.)

2. How to compare digital against your other channels

This is where most business cases lose the argument, because they don’t realise that the Finance Director is thinking about how else this budget can be invested. So you need to show you understand this and present some other channels for comparison.

Be careful here you don’t compare digital's fully loaded CPA against another channels direct cost. For example, face-to-face's agency fee per sign-up. The F2F number may exclude staff time, fulfilment, welcome pack, compliance overhead and some attrition. Compared on that basis, digital will always look expensive.

Four rules for a fair comparison:

1. Same cost basis. Fully loaded on both sides, or media/agency fee only on both sides. Not one of each.

2. Same income basis. Cash only, or cash plus Gift Aid - consistently across channels.

3. Same time horizon. Compare payback at 12, 24 and 60 months. A channel that wins at 12 months may lose at 60, and vice versa.

4. Same attribution rules. Digital is systematically under-credited by last-click reporting because it also drives sign-ups that complete elsewhere. Note this explicitly rather than pretending it away.

What the comparison usually shows

Below we have given you the indicative ranges we see across UK and European clients. Please treat these as a starting point for your own modelling, not the final word, because they vary enormously by cause, market and other factors like the quality of your ad creative:

Sequoia's regular giving research puts face-to-face first-year retention at around 50%, against 86% for direct mail recruits - a gap that tells you most of what you need to know about why channels with a high average donation can still have long payback periods.

It’s worth noting: digital rarely competes with face-to-face on volume. What it does offer is a shorter payback period, often better retention, a younger donor profile, and - critically - flexibility with your investment. You can adjust digital spend month to month. It’s much harder to adjust other types of fundraising spend in this hands-on way. In a volatile funding environment, like we have right now, this ”optionality” has real benefits and it's worth trying to shout about this when you make your case.

3. Structuring the business case over two years

We often get asked how long a period the investment case should be made for. Our advice is that two or three years is the right window. One year is too short to show the compounding effect and makes the programme look like a cost. Five years invites arguments about assumptions nobody can defend.

Build the whole case on four metrics.

The four numbers

1. Average monthly donation. Use a tested figure, not an aspirational one. If you haven't tested, model conservatively. And remember that a higher ask isn't automatically better - what matters is contribution per £1,000 of media spend, not just the headline average gift. A £15 ask that halves your conversion rate has a big impact.

2. Annual retention rate. This will be the most contested number in the model, so handle it carefully. Model year one and year two-plus separately, because attrition is heavily front-loaded - the biggest losses happen in months one to four, and a large share are failed payments rather than active cancellations. If you don't have your own digital RG retention data, use a conservative external benchmark and flag clearly that it's an assumption to be replaced with real data at month twelve.

3. Cost per acquisition (CPA) of a new regular donor. Fully loaded, as above. Build in cost inflation for year two: Meta reported an average increase of over 14% in cost per ad served across Europe last year, and charities should plan for continued CPM rises rather than assuming flat costs. We would just use 5 or 10% for this.

4. Payback period. This is an output of the first three, not an input. If you find yourself setting a payback target and reverse-engineering the assumptions to hit it, stop.

A worked two-year model

Illustrative figures - replace every one with your own:

Assumptions: £10 average monthly gift; 80% Gift Aid eligibility (effective £12/month); 75% year-one retention, 85% thereafter; CPA £120 in year one rising to £130 in year two as you scale.

Payback on the year-one cohort lands at roughly 11–12 months. You can adjust and put in your own numbers. 

The last line on the table above is one of the most effective. You are not asking your organisation to spend £250,000 to make £333,000. You are asking them to spend £250,000 over two years to build an asset that generates around £200,000 every year afterwards, at a fraction of the cost to service. Make the case you are building a valuable asset into the future, not one-off campaign spend. I remember doing a study with UNICEF once where we found out many donors were still giving after 13 years. This is why Regular Giving programmes are so exciting! 

Always include sensitivities

Decision makers trust a case with downside scenarios far more than one without. Here are some examples:

• Average gift falls to £7. Payback stretches from 12 months to roughly 16. Uncomfortable, still viable.

• Year-one retention comes in at 65%, not 75%. Payback period barely moves - about two weeks. But five-year value falls by roughly a third.

• CPA rises 15% above plan. Payback period moves to around 13–14 months.

4. What media budget should you start with?

This is the question we get asked the most! The most common mistake is starting too small to learn anything - then concluding digital doesn't work.

You need enough conversion volume for the platforms to optimize and for the cohort not to be so small that a small change can have a massive effect on the underlying metrics. As a rule of thumb, budget monthly media of at least 20–30× your target CPA. At a £120 CPA, that's £2,500–£3,500 per month. Below roughly £2,000 a month your cohort will be so small it will be statistically meaningless.

The recommended starting point. For most charities running a genuine first test, we'd suggest a ring-fenced pilot of £30,000–£50,000 across six to nine months, split roughly 70–75% media and 25–30% creative, management and technology. At a £120 CPA that recruits somewhere around 250–400 regular donors - enough to produce a real twelve-month retention analysis and adjust your case accordingly.

Three things your budget should cover beyond media:

• Creative volume. This is one of the biggest performance variables. As Meta's targeting narrows and its AI systems reward variety, charities consistently tell us creative capacity is their binding constraint. Underfunding creative to protect media spend is a false economy in 2026.

• The donation experience. Form optimisation and A/B testing can make a real difference. 

• The welcome and onboarding series. Your retention assumption will mean you need to do some work here most likely.

5. The three objections you will get - and how to answer them

"Year one shows a loss." 

• It will, and it should. Fundraising acquisition costs are expensed as incurred, while the income arrives over future years. This is why we map out two or three years. You should promise to continue reporting on your assumptions transparently and keep making the case that this is not a one-off campaign but donors that will likely be giving well into the future. 

"This will push up our cost of fundraising ratio." 

• Temporarily, yes - as would any growing acquisition programme in any channel. Show the finance team the projected income over time as the programme matures, and point out that the ratio will only improve over time with investment. 

"How do we know these donors will stay?" 

• You don't yet - which is exactly why you should propose this is reviewed at months three, six and twelve, and the model adjusted. It’s important to be honest and transparent here and this will help with trust. 

In summary

A strong case for investment in digital regular giving does four things: 

1. it leads with payback period rather than ROI

2. it compares channels on a genuinely like-for-like basis

3. it models two years on four defensible metrics with sensitivities attached

4. and it asks for a budget big enough to produce a real answer.

Get those right and you might just get it approved. You're presenting a plan to build a predictable, unrestricted, compounding income stream - which is a considerably easier conversation to have. And if you need help, reach out! 

Building a case for investment in digital regular giving, or want a second opinion on the numbers before you present it? Nick Burne Digital has helped charities across the UK, Europe and global markets build and scale digital regular giving programmes. Get in touch for a zero-pressure chat.