I can see four main reasons to hold cash:
+ Emergencies (car repairs, house repairs, human repairs, etc). Can usually be covered by credit card allowing time to retrieve funds from wherever you choose.
+ Planned major expense (New Car, house improvements, house move, etc.)
+ Buffer against major market falls.
+ Cash to take advantage of investment opportunities.
For context, 12 years retired, mid-60s with 23% cash, 77% investments (of which 90% are equities). Living on DB pensions which easily cover all expenditure. SIPPs as yet untouched.
For us, the most important reason for the cash is for a future house move and as a buffer against falls. Although instant access account paying just under 5% hold a fair amount we are continually feeding money into regular savers to take advantage of rates up to 7%.
OM