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Budget Allocations by category but based on different granularity

I am trying to work on a personal finance report and want to incorporate monthly budgets I set for myself.


I have created the data model as the following:

Transactions Table = Export from Bank transactions outlining day to day transactions with the vendor name

Category Mapping = Table that maps Names of vendors to a set amount of category

Budget = A set of categories, their budgeted number (monthly)


I have a one to many relationship on Vendor with Transactions and Category Mapping and a One to many relationship with Budget and Category mappings on the Category name.


So the dataset looks something like this:

Date | Vendor | Amount

Day x | Vendor x | Amount

Day x | Vendor z | Amount

Day y | Vendor y | Amount

Day z | Vendor B | amount


Category Mapping

Category Name | Vendor

Category Name 1 | Vendor x

Category Name 2 | Vendor B

Category Name 1 | Vendor y

Category Name 3 | Vendor z



Category Name | Budgeted
Category Name 1 | 100 (budget)
Category Name 2 | 200 (budget)
Category Name 3 | 100 (budget)


I am having a really hard time coming up with a measure that would show me the difference in the amount spent vs amount budgeted on a monthly basis. I know the data is on different granularities as the data in transaction is daily (and can have multiple days) vs data in the budget is just a single monthly value by category..and I just cant figure out how to relate the two.


So far this measure would show me the amount of spend by categories:

SpendByCategory = SUMX(VALUES('Category Mappings'[Category]),CALCULATE(SUM('Bank Export'[Amount])))
But how do i lookup the category and pull the amount that I need to subtract from the actual spend ?

Super User
Super User

@JayJay25 , refer if these two blogs can help


Power BI Distributing/Allocating the Monthly Target(Convert to Daily Target): Measure ( Daily/MTD):

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