The MBA admissions process requires determination, dedication and hard work. But don’t let the effort required to gain admission stop you from tackling another important aspect of business school success: your budget.

Given the rising cost of a top business degree, even a small budgeting mistake can cost you a fair amount. Here are three mistakes to avoid as you create your plan to pay for business school.

1. Not starting early enough: Ideally, you would have considered the cost of an MBA when deciding whether to attend business school or in the first place. This includes thinking about tuition along with external costs such as wages lost by leaving your job.

Either way, as soon as you have any financing questions at all, you should contact your prospective school’s financial aid office. You can also get advice through admissions events. Financial aid officers are an amazing resource. They’ve seen it all before, and they wantto ensure qualified candidates can pay for a degree.

Starting early – about three months before applying – is also important if you’re pursuing scholarships, fellowships or grants. Since scholarships are free money, competition can be fierce, and you’ll benefit from having the time to create strong scholarship applications and from knowing the key deadlines so that opportunities don’t pass you by.

2. Not thinking beyond your cost of attendance: The advantage you’ll get from early budgeting is only as good as the numbers you’re starting with. While the school’s published cost of attendance is a clear starting point that factors in tuition as well as cost of living estimates, you may need to cover additional costs before, during and after your program.

To address the before costs, you’ll want to assess your personal financial situation carefully to see what your cost of attendance really entails. For example, it might cost you money to relocate to a new city or commute to campus.

You also might still have recurring bills that can’t be changed, such as an installment loan on a large purchase. Even updating your business wardrobe to prepare for interview season can amount to several hundred dollars if you’re not planning carefully.

To understand what added costs you might incur during and after school, brainstorm all the opportunities you’re interested in that require extra spending. This could include dues for your target clubs, study abroad expenses and attendance fees for conferences.

If you’re planning to intern in a new city during the summer, you’ll need to budget for the upfront cost of moving as well.

3. Not investigating all your options: Once you’ve gotten a head start and pinned down the amount you’ll need to budget, make sure you don’t leave any funding options on the table. It might seem daunting to call up student loan companies and interview these potential lenders, but finding the best student loan option out there will save you thousands of dollars and avoid hours of logistical headaches.

Don’t be afraid to get creative either or even to ask for money. If you know your post-MBA plans, you may be able to negotiate with your employer for sponsorship during your MBA. Finally, review your existing assets and whether you’ll benefit from tapping into retirement accounts or other investments to fund your MBA.