It's a very big risk you are taking there by investing your 100% of your income. Even if your salary date is very close I still encourage you to go all 100% in with your income. What if something happens along the line and your salary is a bit delayed from the usual schedule. You know whatever that involves human can experience some setback at one point or the other. But to be on the safer side, you can go in with at least 70% of it and hold on to the remaining 30%, if the salary comes as you were expecting then you with the 30% you set aside. This is done as a precaution should in case there is a little delay of your salary payment for let's say few days or a week. If the salary didn't come immediately as expected, you will still have your 30% to cover your expenses. This way your daily life won't be affected.
The journey of BTC is still very long and this is only just beginning and only a few percent, the important thing is that we have started buying by continuing to commit and for the amount it must be different assuming everything has been calculated correctly that when we buy BTC with DCA-style installments it does not become an additional burden and damage our work physiology because we both feel the current level of need is all high, Moreover, it only relies on one currency, which is salary.
I am also a person who has a monthly salary and works in the government, For investment I focus more first on my family's monthly expenses and for investment I allocate buy BTC with DCA according to propriety, sometimes this month it can get 0.00047 BTC and sometimes next month it can be up to 0.00067 BTC.