In short: controlling spend means knowing on the 12th whether you'll close at €6,000 or €7,400 and having room to correct. Three daily figures are enough: actual cumulative, expected and projection; a deviation above 5-10 % calls for a look. One day at double is normal; several days in a row, a sudden zero, or a change you didn't make, are not.
The month's plan is a number; the actual month is a spend curve that climbs every day. The gap between the two is spend control: knowing on the 12th whether you are going to finish on €6,000 or €7,400, and having time to correct it. This lesson is the minimum dashboard and the routine that goes with it.
How should spend rise over the month?
With fixed daily budgets, the expected running spend on day d is
monthly total × d / days in the month. The actual figure wobbles around
it (a single day can spend up to double), but the running total should
track the straight line. Three figures every morning:
| Figure | How |
|---|---|
| Actual running total | Month's cost up to yesterday |
| Expected running total | Plan × days elapsed ÷ days in the month |
| Projection | Actual running total ÷ days elapsed × days in the month (better still, using the last 7 days' average) |
If the projection drifts more than 5-10% from plan, there is something to look at.
Which spend deviations are normal?
| Variance | Normal if… | Alarm if… |
|---|---|---|
| Daily spend = 2× the budget on one day | It is a strong day and it balances out | It happens several days running (an unintended budget change, a new campaign) |
| A campaign spends less than its budget | Smart Bidding target sitting at its marginal; low demand | It drops to zero all at once (disapproval, broken conversions, spending limit) |
| Running total above plan mid-month | You raised budgets on purpose | Nobody raised them: an auto-applied recommendation, a rule, another user (change history) |
| Campaign limited by budget | It is profitable and it is part of the plan | It is not profitable and it keeps eating |
| Spend spike on one network or location | A known event | Display expansion switched on, a new farm, a click app |
Which spend alerts should you set up?
- Automated notification rule: campaign daily spend > 2.5 × its budget → email.
- Safety rule: account spend for the day > X (an absurd ceiling) → pause campaigns and email. The only rule that acts on its own.
- Conversion alert: conversions for the day = 0 with normal clicks → email (Measurement).
- Account spending limit (Billing): a hard monthly ceiling Google will not go past; useful as a safety net, not as a management tool (it cuts indiscriminately the day it is hit).
What should you do mid-month if you're off track?
The 15th is the moment to correct with time to spare:
- Projection vs plan: where is the variance? (campaign, network, day).
- If you are running under and the good campaigns are limited: raise budgets (in steps) on the best marginals; if they are not limited, do not force the spend — the month closes under plan and that is fine.
- If you are running over without having decided to: change history first; then cut where the CPA is worst, never on what is beating target.
- Recalculate the dailies:
(plan − running total) ÷ days remaining, and apply in steps (an abrupt recalculation on the 15th resets learning).
How do you close the month?
- In the last few days you do not touch budgets "to make the numbers add up": the 30.4× monthly cap already protects you, and moving things on the 28th only disrupts next month.
- On the 1st: actual spend vs plan by campaign, with the reason for each variance written down. That is the input for next month's split (lesson 4).
- Billing: check that the charge matches the Google Ads cost (discounts, credits, taxes).
How do you control spend across several accounts or currencies?
In a manager account (MCC), control happens per account and is then aggregated: each account has its own plan, its own currency and its own pace. A table with one row per account (plan, running total, projection, variance %) is the single most useful report an agency can have on the 12th.
💡 Ninja trick: the Suite's Guardian is exactly this dashboard, calculated daily per account and campaign: spend against the monthly target, projection, days with no spend or no conversions, anomalous spikes, limited campaigns with a good CPA — with email alerts at 0, 3 and 7 days of drift, deduplicated (it will not tell you the same thing every morning). It is free in the panel: it is the first script that should be running in any account.
What you should remember
- Three figures a day: actual running total, expected, projection; variance > 5-10% = go and look.
- Normal variances (a 2× day, a target sitting at its marginal) versus alarms (several days running, a sudden zero, changes you did not make).
- Alerts: spend notification, account safety rule, conversions at zero; the spending limit as a net.
- The 15th: correct in steps towards the best marginal; month-end hands off; the 1st: review and reasons.