Can someone please have a look over these basic calculations I've made regarding an annual income and the essential taxes and considerations I think I need to make.
I'm trying to come up with a basic "put this percent of your sales to one side" rule, but numbers aren't my forte.

I've accounted for standard income tax, municipality tax and YEL insurance.
_ . _ . _ . _ . _ . _ . _ . _ . _ . _ . _ . _ .
ASSUMPTIONS
Registered as Toiminimi.
Gross Profit = €33,000
INCOME TAX RATES
a) €0 - €16,300 = 0%
b) €16,300 - €24,300 = 6.5%
c) €24,300 - €39,700 = 17.5%
_ . _ . _ . _ . _ . _ . _ . _ . _ . _ . _ . _ .
INCOME TAX = €2,042
a) €16,300 at 0% = €0
b) €8,000 at 6.5% = €520
c) €8,700 at 17.5% = €1,522
MUNICIPALITY TAX = €6,105
€33,000 at 18.5% (Helsinki) = €6,105
YEL INSURANCE = €2,160
€10,000 at 21.6% = €2,160
TOTAL OUT = €10,307
31.2% of Gross Profit
Keep €22,693 as Net Profit