However, if you are loaning money for the sake of long term investment then it’s useless to pay a loan interest while you can just slowly DCA using your salary every month knowing that you can pay your loan outside your Bitcoin investment. You are just taking unnecessary interest while you are just waiting long term for your investment to grow.
Much better to accumulate slowly using the money that you don’t have any other allocation. Loan will just give you pressure for your investment.
It is not useless, provided you are working and you have job security, of which you can be paying off the loan on installments on monthly or weekly basis, depending on the structure which your salary comes and the agreement you have with your creditors. The essence of if, is to make bulk purchase. It doesn't stop you from doing your DCA if you have more disposable income at the end of the day. Since you won't be using all your salary for repayment of the loan. It's only a percentage of it that will be deducted from source for your loan repayment. There are flexible and soft loans that you can take and you won't even feel it. Just make sure you have a source of income and know if the security of your sources is well guaranteed.
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Taking up a loan for the sake of Bitcoin investment is not something that should be encouraged even though you have the means of paying it back while still doing your DCA or buying your BTC with whatever strategy you are hoping to work with. What is wrong is wrong, and it does not matter if you are going to invest for a long term and have the finance to cover up the loan and interest for that period.
if you can so pay up a loaned money from your salary, why not relax and just constantly DCA with what you are earning and in the long run you will eventually get to your accumulation goal. The amount you will eventually pay up as interest can still enter into your investment and take out the pressure that comes from the people you took the money from who won't let you rest until you have paid up your debt.
One thing with long-term Bitcoin investment is that you normally should work on setting things in place that will help you stay invested for the long run and not put yourself in a position where you might get tempted to sell your BTC just to offset your loan. Terms and conditions that look easy for most loans are mostly used to entice you into taking the loan. After getting yourself in debt and then other uncertainties coming up, you will eventually discover that you have added a lot of problems to yourself that you cannot solve at the same time while building up your investment portfolio..