What would my budget look like if I used real numbers?

Why budgets built on platform data are structurally wrong

You spend $5,000 on Google and $4,000 on Meta each month. Google reports a 4.5x ROAS. Meta reports a 3.8x ROAS. Based on these numbers, you decide to shift $500 from Meta to Google next month.

But when you check your actual revenue against your books, the real picture is different. Google's branded search campaigns inflate its ROAS by claiming customers who were already going to buy. After adjusting for the inflation gap, Google's real ROAS is closer to 3.0x and Meta's is closer to 2.8x. The gap is much smaller than the platforms suggest. And that $500 shift? It probably would not have made any difference.

Worse, maybe your email campaigns (which show up in Mailchimp but not in any ad platform) are driving 20% of your conversions. You are not giving email any credit because it does not live in your ad platform dashboards. The budget conversation should include email, but it never does.

What a real-numbers budget reallocation looks like

When you rebuild your budget using verified data, you are answering three questions:

• What is the real ROAS for each channel? Not what the platform says. What your books confirm. This requires adjusting platform-claimed revenue by your inflation ratio.
• What is the marginal return of the next dollar? A channel with a high average ROAS may have already saturated its best audiences. The next dollar spent might return less than the average. Trend data (is ROAS improving or declining?) helps answer this.
• What channels are missing from the analysis? Email, organic search, referrals, and repeat customers all contribute to revenue but are often excluded from ad budget discussions because they do not live in an ad platform.

How to rebuild your ad budget using verified numbers (8 steps)

1. 1
   Pull 3 months of spend and claimed revenue from every platform

   In Google Ads: Campaigns → export with Cost and Conv. value. In Meta Ads Manager: export with Amount Spent and Purchase Conversion Value. Repeat for all platforms. Three months of data minimum.

2. 2
   Pull 3 months of actual revenue from your P&L

   In QuickBooks or Xero, run a Profit and Loss for each of the 3 months. Note Total Income (or Total Revenue) per month.

3. 3
   Calculate the average inflation ratio

   For each month: sum all platform-claimed revenue, then divide actual revenue by total claimed. Average the ratio across 3 months. Example: if the ratio averages 0.65, platforms overclaim by about 35%.

4. 4
   Apply the ratio to get adjusted revenue per platform

   Multiply each platform's claimed revenue by the ratio (e.g. 0.65) to estimate its real contribution. This is imperfect but far more honest than raw platform numbers.

5. 5
   Calculate adjusted ROAS per platform

   Divide each platform's adjusted revenue by its spend. Now you have a more honest ROAS for each channel. Rank them.

6. 6
   Check the ROAS trend for each platform

   Is the adjusted ROAS improving, stable, or declining over the 3 months? Channels with stable or improving ROAS deserve more budget. Channels with declining ROAS need less, regardless of their current number.

7. 7
   Factor in non-ad channels

   Check Mailchimp or your email platform for email-driven revenue. Check Google Analytics for organic traffic conversions. Estimate what share of revenue these channels contribute. If email drives 15% of revenue at near-zero cost, maybe investing $500/month in better email content would outperform adding $500 to an ad platform.

8. 8
   Build the adjusted budget

   Allocate your total ad budget proportionally to each channel's adjusted ROAS, weighted by the trend direction. Channels with the highest adjusted ROAS and improving trends get the most. Channels with low adjusted ROAS and declining trends get cut.

How to cross-reference the new budget against your P&L

Before implementing your new budget allocation, validate it against your financial constraints:

• What percentage of revenue goes to ads? Divide your total proposed ad budget by your average monthly revenue. If it is above 15-20% for most businesses, you should be very confident in the return before committing.
• Can your cash reserves handle the new allocation? If you are shifting budget to a channel that has a longer payback period, check your Balance Sheet to make sure you have enough cash runway.
• What happens to your net margin? Model the impact on your P&L. If the new budget is $2,000 more per month but adjusted ROAS suggests it should generate $6,000 more in revenue, your net margin improves by roughly $4,000. Make sure this math checks out with real numbers, not optimistic projections.

What it takes to maintain a real-numbers budget

The initial budget rebuild takes 1 to 2 hours. After that, maintaining it monthly takes about 45 minutes: pull updated platform data, check it against your P&L, recalculate the inflation ratio, and adjust allocations.

The challenge is discipline. If you skip a month, the data gets stale and you drift back to using platform numbers by default. Most businesses that attempt this exercise do it once and then revert within two months.

Or let Bottomline rebuild your budget using verified data

Bottomline connects to your ad platforms, email tools, and accounting software. It calculates the inflation gap, adjusts ROAS for every channel, and shows you what your budget should look like based on real revenue.

No manual inflation calculations. No spreadsheet modeling. Every month, Bottomline shows you where your money should go based on what actually works, measured against your books.