Salary and rent?

In my experience (though it's been a while), when you fill out an application, you are asked to include any sources of income besides a salary that will help you meet your rent obligations. Discuss this with landlords or brokers.

40 times? Not possible.

Most landlords require you make at least 3 times the rent. So if you make 3000 a month you could afford 1000 monthly rent. If you have a trust fund -any income from that trust fund would normally be included as income. If your parents are going to pay your rent then they would so-sign the lease and their income would be included in qualifying. I think what you may have heard is you may need to make (as an annual salary) 40 times the monthly rent. That would be pretty similar to the monthly salary being three times the monthly rent. So someone may have told you that.

The general rule of thumb is you need to earn x3 the rent, so not sure where you got the idea it is x40

The monthly income from the trust would be considered your income, with your earned salary. If you need your parents' help to pay the rent, they likely would not rent to you, unless you are a student.

They do let you qualify based on assets instead of, or in combination with, income.

A typical requirement is 10 times the annual rent (120 months' rent).

This multiplier, like the 4x income, is a reflection of the fact that you will not spend all of your money on housing.

If your parents co-sign your lease, then their income and assets will be included - but so will any rent they are already paying for their own home.

No. You would still need a job that pays 40x the monthly rent. Trust fund can be spent quickly...and landlords know this.

Some would, some wouldn't. You can ask.

All income counts. If you need an income of $XXXX to qualify to rent, it does not matter where (as long as it is legal) that income comes from

For example if your trust fund pays you 1/2 of the required income and you make 1/2 from your employment, you would qualify