Is it possible for me to pay the lease amount of installment payments due to the fact of me being unemployed at the moment ? Or will i be able to adjust those payments?

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You can pretty much set up the amount you want to pay in your installment plan, and it can be changed after it is set up, but keep in mind, the more you pay now (and the sooner you pay in full) the less you will have to pay in interest fees and penalties.  This link can provide more information: 

https://turbotax.intuit.com/tax-tips/tax-payments/facts-about-irs-payment-plans/L1zHPFVDI