· Updated October 05, 2026 · 3 min read
Daily vs. lifetime budget in ChatGPT Ads: which one, when?
When creating a ChatGPT campaign you make a fundamental choice: daily budget or lifetime budget. Both cap your spend — but in very different ways, and the choice can't simply be toggled later. Here's the decision guide, with the API's rules and the cases from practice.
The difference in one sentence
- Lifetime budget: a cap for the campaign's entire runtime. Once reached, serving stops for good.
- Daily budget: a cap per day that renews every day. Once reached, serving resumes the next day.
Important: you pick exactly one of the two per campaign. The API rejects a campaign that carries both values — daily and lifetime budget can't be combined. And the daily budget has a minimum of 15 in your account currency; below that you also get an error. Chatvertise checks both in the campaign form before the request goes out.
Spend over one week (schematic)
Daily budget
At most the cap every day — it starts fresh the next day.
Lifetime budget
Day 6–7: used up
No daily cap — once the total is reached, serving stops.
When daily budget?
- For always-on campaigns without a fixed end date, such as ongoing advertising for your core products.
- For testing new ads with predictable, even daily spend — a test that burns the whole budget on day one yields no data.
- When you want to cap spend per day because several people or automation rules work on the account.
- For campaigns whose bids you're still calibrating: a bid set too high then costs at most one day, not the whole budget.
When lifetime budget?
- For time-bound actions: product launch, sale, event, Black Friday weekend. The budget can't overrun.
- When a fixed total amount is available that the campaign should use up over its period — typical for client budgets at agencies.
- Combined with start and end date for a clear campaign runtime and a clean final report.
Where the number comes from
Whichever type: the amount should come from a calculation, not from gut feeling. Target CPA times expected conversions gives the budget; budget divided by expected CPC gives the clicks you buy with it. Our article on the ROAS math walks through it with example numbers, and the free budget calculator runs it with your values.
Good to know
- A daily budget doesn't “deplete” over the period — it restarts every day in the account time zone.
- Both caps apply per campaign. Three campaigns with a daily budget of 50 each can spend 150 per day together.
- In addition, eligible accounts have a separate, account-wide daily limit across all campaigns — a different tool with different prerequisites, explained in Account daily limit vs. campaign daily budget.
- For lifetime budgets, Chatvertise shows utilization and warns before a campaign quietly stops; for daily budgets that isn't needed.
In Chatvertise you choose budget type and amount directly in the campaign form — the same form for regular and for AI-generated Shopify campaigns, and the detail page shows the amount with a “/ day” suffix when it's a daily budget. Connect your API key and start for free.