I learnt one important lesson during the FIRE journey. It is the importance of buffer. I always give a wide buffer on the expenses which I forecast to be incurring for the next year. This gives me the peace of mind and I will not be surprised by the shock should I decide to underestimate the expense. Although I give the wide buffer on the expense, it does not mean that I will have to spend all the allocated expenses for the year. The same thing applies in respect of the dividend generated by the investment portfolio. I underestimate the generated dividend amount for the next year. This will give me the surprise in the event if there is an increase in the generated dividend amount. I believe that the forecast of lower generated dividend and higher expenses will allow me to have overall buffer as I assume the forecast to be the worst case scenario. Any better than the said worst case scenario will be a bonus for me and this gives me the peace of mind.