Understanding 1120H

We are a HOA in Michigan, we maintain a private road and collect dues of $150 and $75 to a sinking fund. The way I read the 1120H is that since we collect only dues all of our income is exempt income, meeting the 60% test. But, last year we had less snowfall than normal and we would like to put the excess income we made into our sinking fund for future road repair. If we add that transfer to our current year expense and take a percentage, we do not meet the 90% test for expenditures. Does that mean we would not be able to file a 1120H? And also have to pay tax on the net income?

There will usually be left over funds in the operating budget when costs are less then the amount budgeted for.
Placing those funds into the Reserves is allowable and does not jeopardize the use of 1120-H (and the funds are not seen as taxable).