% Variable Custom Expenses Ad Spend
How much of your revenue goes to marketing costs that never appear in an ad account.
What it means
% Variable Custom Expenses Ad Spend is the share of Total Sales taken by the variable entries on Cost Settings that you marked as Ad Spend — agency percentages, affiliate and influencer commission, marketing tools charged as a rate. Each one is defined as a percentage of Total Sales, a percentage of ad spend, or an amount per order.
It's a slice of % Variable Custom Expenses% Variable Custom ExpensesSee the full entry., not an extra cost. Marking an entry as Ad Spend doesn't charge it twice; it files the same money under marketing, which is what makes True Ad SpendTrue Ad SpendAd Spend including the custom expenses ad spend configurations larger than Ad SpendAd SpendRead it next to ROAS and sales; spend only helps if the return holds..
Show the math
Formula and a worked example
Variable Custom Expenses Ad Spend is every variable entry marked as Ad Spend, resolved at its own rate for the period. Entries covering only part of the range are prorated by the days they cover.
Total Sales is everything you took in, tax and delivery charges included.
Worked example. March: €120,000 of Total Sales and €30,000 of ad spend across Meta and Google. Your agency charges 10% of ad spend and you've marked it as Ad Spend, so it bills €3,000. The column reads 3,000 ÷ 120,000 = 2.5%.
The fee was charged on spend, but this column divides by sales. Double the budget to €60,000 with sales unchanged and the fee doubles to €6,000, so the column reads 5%. The marketing bill grew and the revenue didn't — which is precisely the read this column exists for.
It answers the question
What does the marketing you can't see in an ad account cost you per euro of sales? Meta and Google bill for the media. This is everything else you pay to sell, measured on the same scale.
Why it matters
Ad Spend is what the platforms charged. The agency running the account, the affiliate taking a cut, the influencer on a percentage and the tool with a rate attached are all marketing money and none of them appear there. Reading the platform number alone understates what acquisition costs, sometimes by a lot.
This column is the correction. It's the variable half of what separates True Ad Spend from Ad Spend, and True NCPATrue NCPAUse this to judge if your acquisition cost is sustainable. from NCPANCPAWhat it costs to win a first-time buyer. — and if those pairs match each other exactly, nothing has been marked.
Because it's a share of Total Sales, it reads on the same scale as MERMERWhole-business marketing efficiency across every channel.Under 30% is healthy, which is Ad Spend ÷ Total Sales. That's what makes them addable in your head.
What good looks like
There are no published bands here, and no universal number — an affiliate-led business and one running its own ads in-house sit in completely different places and both work. Judge it against the deals you signed and against the column's own steadiness.
Two readings always mean something. This climbing while MER stays flat means the fee is charged on a base that grew when your sales didn't — usually ad spend. And 0% while you're paying an agency every month means nothing has been marked as Ad Spend, so every acquisition figure on the page is quietly flattering you.
How to improve it
| Lever | What you do | Expect | How long | Watch out for |
|---|---|---|---|---|
| Fast Mark the entries that really are marketing | Go through Cost Settings and flag the agency, affiliate and influencer rates as Ad Spend | This column rises from wherever it was to the truth | Same week | True NCPA gets worse the day you do it. That isn't a new cost — it means the acquisition numbers you've been reporting were understated all along. |
| Fast Re-cut the rate | Renegotiate the percentage on the largest marketing entry, or cap it above a spend level | The share falls by the points you cut | 2–4 weeks | An agency on a lower percentage gives you fewer hours, and affiliate cuts cost you the partners who were doing the selling. |
| Slow Move the fee off spend and onto results | Shift a partner charging a percentage of ad spend onto a percentage of the sales that spend produced | The cost stops rising on budget alone | 1 quarter | It costs more in a strong month, and a partner paid on sales will push for the spend that produces them. You changed which way the risk points, not how much there is. |
| Slow Bring the work in-house | Replace the retained percentage with your own team running the accounts | This column falls toward zero | 1–2 quarters | The cost moves to payroll, which is a fixed entry — it doesn't shrink when the month does. You swapped a rate that flexes for a bill that doesn't. |
Every lever costs something somewhere. The last column is the one to read twice.
Read it with
Platform spend and the fees on top are two different shares of the same revenue. Neither is your marketing cost on its own.
Efficiency you paid for
The platforms got cheaper per euro of sales and the fees on top got dearer. Often a partner charging on spend while spend rose — the media improved and the total didn't.
Marketing squeezing from both ends
Media and fees are each taking more of every euro. This is the corner where the true cost of marketing has moved and neither number shows it alone.
Genuinely cheaper
Both shares falling means sales grew faster than the media and the fees on it. Every point is Net Profit you didn't have to negotiate for.
Spend up, fees flat
Media is taking more per euro while the fees on top take less. Usually a fee charged on sales or per order while the ad budget grew ahead of them.
This is the money that makes True NCPA differ from NCPA. Read them together and you can size the gap: if True NCPA is barely above NCPA while you pay an agency a percentage every month, the entry isn't marked and your real cost of a new customer is higher than either number says.
The variable slice against the whole marketing slice, fixed and variable together. If the two are equal you have no fixed marketing entries, so a retainer somewhere is either missing from Cost Settings or filed as something other than Ad Spend.
Common misreads
It isn't. This is marketing money you typed into Cost Settings and marked as Ad Spend. What Meta and Google actually billed is Ad Spend, and the two only meet inside True Ad Spend.
Zero is also what an unmarked agency fee looks like. Check the variable list on Cost Settings before you read it as good news — an entry left unmarked still costs you the money, it just lands somewhere quieter.
The denominator is sales. A fee percentage that never changed, against a smaller month, raises this column with the invoice untouched. It can also rise because ad spend grew, if that's what the fee is charged on.
Also called
Marketing fee share · agency and affiliate cost as a share of sales · off-platform ad cost share
See yoursYour marked marketing share for the period, next to MER, True Ad Spend and the entries behind it on Cost Settings.
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