How to set a Microsoft Ads budget
This guide explains how Microsoft Advertising budgets spend across a day and a month, how to choose a beginner bid strategy, and how to change budgets without resetting learning or getting overwritten by an import.
Microsoft Advertising budgets are set at the campaign level, not per ad group. Most campaigns use a daily budget, which Microsoft treats as a target: spend can be higher or lower on any day, while the real limit is calculated for the whole month.
Your bid strategy decides how Microsoft bids in each auction. The budget caps spend; the strategy chases the result you choose, such as clicks, conversions, or conversion value.
Choose a budget type
Microsoft offers three types. Daily – Standard spreads spend through the day based on search availability. Shared – Standard works the same way but is shared by two or more campaigns. Lifetime sets a total for the whole campaign and is only available for Audience campaigns. For Search campaigns, choose a daily or shared budget.
Watch outOn Audience campaigns you cannot switch between a standard and a lifetime budget after saving.
Work out the daily number
Microsoft calculates your monthly budget as the daily budget times 30.4, the average number of days per month. Divide the amount you want to spend in a month by 30.4 and enter the result as the daily budget. A $600 monthly plan works out to roughly $20 a day.
Understand daily overspend and monthly limits
Because the daily budget is a target, some days spend more than it. Microsoft says it usually keeps overspend to less than 100% above your daily limit, meaning under twice the daily budget. If spend ever goes over the monthly limit, Microsoft refunds the overspend at the end of the month. When a campaign reaches its daily limit, its ad groups pause for the rest of that day.
Pick a beginner bid strategy
Without conversion tracking, use Maximize clicks or Enhanced CPC. With a UET tag and active conversion goal, Maximize conversions aims for the most conversions in budget and Maximize conversion value aims for revenue. Since August 4, 2025, standalone Target CPA and Target ROAS cannot be set up on new campaigns; add a target CPA or ROAS value to the Maximize strategies instead.
Give automated bidding time to learn
Microsoft describes a learning period of 1 to 2 weeks and recommends letting a strategy accumulate at least 30 conversions before judging it. Changing budgets or conversion goals during learning may restart it. When you adjust a target CPA, Microsoft suggests keeping changes within 10% to 15% up or down.
TipPlan a test budget that can realistically produce conversions within a few weeks, based on what a customer is worth to you.
Change a budget
Select Campaigns in the navigation, select the campaign name, then select Settings from the page menu. Under Campaign budget, enter the new amount and select Save. Microsoft says budget changes generally take effect within an hour or so.
Know what a mid-month change does
After a change, Microsoft recalculates the monthly limit as your spend to date plus the new daily budget times the days remaining in the month, including today. A late-month increase therefore adds less monthly spend than the same increase made early in the month.
Watch for automatic budget changes
Budgets can change without anyone editing them. Scheduled Google Ads imports can reset budgets to their Google values unless Update existing campaign budgets is turned off. Automated rules and shared budgets can also move amounts. If a budget looks wrong, open the Change history tab to see what changed it.
Before you move on
- Daily budgets equal your monthly amount divided by 30.4
- The bid strategy matches whether you have conversion tracking
- Import schedules will not overwrite your budgets
- Prepay accounts have enough funds for the month
- You know how to check change history
Official resources
- Microsoft Advertising Help: Discover your budget options
- Microsoft Advertising Help: Set your campaign budget and bids
- Microsoft Advertising Help: Bid strategies
- Microsoft Advertising Help: Scheduled imports and history
Ad platforms update their tools often. This guide was last reviewed against the official documentation above in October 2026. If your screen looks different, the official help pages have the latest steps.
At a glance
- Level
- Beginner
- Time
- About 20 minutes
- What you need
- A Microsoft Advertising account with at least one campaign
- A monthly amount you are prepared to spend while testing
- A UET tag and conversion goal, if you want conversion-based bidding
- Knowledge of any Google Ads import schedules on the account
Rather have it done for you?
Active Digital Marketing builds and manages Microsoft Advertising accounts for businesses doing $25,000+ a month in revenue.
Apply to work with usOr get an ad account auditWhere DIY setups go wrong
The most common problems with self-built Microsoft Ads setups, and what they cost.
Budgets reverting after an import
A scheduled Google import set to update budgets will keep resetting Microsoft budgets to Google values. Owners often think the change did not save.
Using conversion strategies without tracking
Maximize conversions and conversion value need a UET tag and an active goal. Without them, the strategy has nothing to learn from.
Changing everything during learning
Budget and goal changes in the first weeks can restart the learning period. Results then look worse for longer than they need to.
Running prepay with no buffer
When prepaid funds run out, the account pauses until money is added, and some payment methods take days to clear.
What this guide doesn't cover
A budget sets how much you can spend. Profit comes from deciding where it goes: how much Microsoft should get compared with Google, which campaigns deserve more, what targets reflect your margins, and how to scale without efficiency falling off.
ADM manages Microsoft Advertising budgets for established brands as part of a combined search plan, measured against contribution margin rather than platform numbers alone.
- Budget split between Google and Microsoft search
- Target CPA and ROAS based on real unit economics
- Import settings that keep Microsoft budgets independent
- Bid adjustments by device, time, and audience
- Scaling plans and seasonality
Common questions
Why did Microsoft spend more than my daily budget?
The daily budget is a target. Microsoft usually keeps overspend under 100% above it, and the actual limit is calculated for the month.
What happens if I go over my monthly budget?
Microsoft says that in the unlikely event a campaign spends over its monthly limit, it refunds the overspend at the end of the month.
Can I set a budget per ad group?
No. Microsoft Advertising budgets are set at the campaign level, or shared across campaigns.
Why does my budget keep changing back?
The most common cause is a scheduled Google Ads import that updates budgets. Check Import schedule & history and the Change history tab.
Keep learning
How to Create a Microsoft Advertising Account
Sign up for Microsoft Advertising, choose import or a fresh start, set time zone, currency and billing, add users, and complete identity verification.
Read the guideHow to Create a Microsoft Ads Campaign
Import from Google Ads or build a Microsoft Ads Search campaign: goals, locations, keywords, responsive search ads, ad distribution, and going live.
Read the guideHow to Install the Microsoft UET Tag
Create and install the Microsoft Ads UET tag, set up conversion goals, add enhanced conversions and consent mode, and test with UET Tag Helper.
Read the guideHow to Set a Meta Ads Budget
Learn how Meta ads budgets work: campaign vs ad set budgets, daily vs lifetime, bid strategies, spending limits, pacing, and safe budget changes.
Read the guideHow to Set a Google Ads Budget
How Google Ads daily and total budgets work, the 2x daily and monthly charging limits, beginner bid strategies, and how to change budgets safely.
Read the guideHow to Set a TikTok Ads Budget
TikTok budgets explained: daily vs lifetime, campaign and ad group minimums, bidding basics, and how to raise budgets without disrupting delivery.
Read the guideRather have it built right the first time?
If your business does $25,000+ a month in revenue, apply and Mitch will review your accounts personally. Earlier than that? An ad account audit gives you a senior-level fix list you can work through yourself.