Hello there! consider this format : Mr./ Ms. Landlord (Address) Subject: Request to review your decision regarding the raise in Rent Esteemed Sir, Reference to your letter dated ... Regarding an increase in the monthly rent of my flat, I humbly want to make a sincere request that for the time being my financial condition doesn`t allow me to afford this increment for the next 6 months. I have occupied this flat just few months back and have been paying my rent regularly and on time. As unprecedented hike in the prices of commodities has overburdened the salary class. All middle class families are burning both ends of candle saving not a single penny. God has blessed you with all His bounties. Your generosity is famous in the nook and corner of this city. I beseech you to please review your decision and give me at least 6 moths time making me enable to pay the extra amount you are asking for in terms of rent-increment. Hopefully a generous heart would surely think about the sufferings of another fellow. God Bless you. Your tenant xxxxx xxxxx Make sure you complete all the details needed. Always show respect and use correct terms to show sincerity and formality to your letter.