Raise the budget on what already works. A new campaign enters learning at the worst possible moment, and you will not have enough time to get it out.

On this page

• Why do new campaigns fail during peak season?
• How should I ramp budgets into Black Friday?
• Will my sale price actually reach the Shopping feed?
• What does a discount actually cost in gross profit?
• How do I read performance across a promotion boundary?

Why do new campaigns fail during peak season?

A new campaign has no history, so the bidder predicts near-zero and bids near-zero. That resolves over weeks, and Black Friday is a window measured in days.

The exception is a campaign that needs to exist for a structural reason — a promotion that cannot run inside your current structure, or a product set you genuinely do not advertise. Build those weeks early so they have history before they are needed.

How should I ramp budgets into Black Friday?

Step up in roughly 15% increments, gated on cost per acquisition, starting well before the peak. Ramping into the period rather than jumping on the day gives the bidder time to find inventory at the higher spend level.

Check the monthly ceiling. Google caps monthly spend at daily budget × 30.4, so a campaign already pressed against its cap will throttle at exactly the wrong time. Measured on an apparel account: $7,935 against an $8,056 ceiling — 98.5% consumed, delivery cut to $212 and $132 on the final two days.

Will my sale price actually reach the Shopping feed?

If a Shopping feed is live, the sale must be a price change or a Merchant Center promotions feed entry. A cart-level automatic discount never reaches the feed, so Shopping and shopping-style placements keep quoting full price while your site is on sale.

Buy-one-get-one is excluded from the standard channel app sync path — promotions feed only.

Check the promo works end to end, not just that it exists. A promo that is running can still be broken.

What does a discount actually cost in gross profit?

• A percent-off costs d ÷ m of gross profit
• A free unit costs (1 − m) ÷ m

At 87.5% margin a buy-one-get-one reads as 50% off and costs 14.3%.

And your breakeven moves. At 72% margin breakeven is 1.39×; at 20% off, margin falls to about 65% and breakeven rises to about 1.54×. A bar derived at full price is too low during exactly the period you are quoting it.

How do I read performance across a promotion boundary?

Site conversion rate is a mix statistic. It rises during a sale and spikes on email send days. Any before-and-after read across a promo boundary is garbage.

Run the control check before attributing anything to what you did: what did the campaigns you did not touch do in the same window? On one account a budget raise was declared a failure using two independent data sources — and the control test killed the thesis outright, because the untouched campaigns fell further. The "baseline" week had contained a holiday and a live 20%-off sale spanning both windows.

Two data sources agreeing on a confounded window is not corroboration. It is the same error twice.

Related questions

My Google Ads campaign says "limited by budget" but it's already beating its target — should I raise the budget?

Yes, and it is the clearest scaling signal in the platform — but raise it in roughly 15% steps gated on cost per acquisition, not in a jump. Read the full answer.

Should I have more than one primary conversion action, or does that double-count my conversions?

Yes it double-counts, and sometimes that is fine. The real question is not how many primaries you have — it is what your bidding is actually optimising toward, and the primary flag is not a reliable answer to that. Read the full answer.

How do I stop Performance Max from spending my budget on YouTube?

You cannot switch YouTube off inside a Performance Max campaign. What you can do is see exactly how much it is costing you, fix the signal that is sending it there, and decide whether to split the campaign. Read the full answer.

Written by Usama Khan, who runs Google Ads for e-commerce brands and home-services companies at AdventurAds. Figures are from accounts under active management and are anonymised. Last reviewed 2026-08-26.