We have a few A4 folders which are as follows
House folder
This includes all details regarding the purchase of house, mortgage details, payments Council tax, House and contents insurances. Any purchases regarding fixtures and fittings are all filed in here. We have house & garden plan details, plus room details, which come in handy when decorating.
Work folder
Anything work related, plus current years salary slips and tax papers go in this folder. All pension related paperwork is also filed here. The cars paperwork is also kept here. Once full it's put into a storage box in the attic.
Healthcare
I live in europe, have to pay for healthcare here so all paperwork regarding healthcare insurance.
Bank folder
All current years banking statement, plus credit card statements and insurances policies. These are put away after a few years into storage in attic.
Invoices and Receipts
This folder is divided into 2 sections first half contains utility bills gas, electric,water, waste,tv, internet etc. All other purchases from electrical items, furniture, clothes etc
Current folder (a slimmer A4 folder) which contains some of the current year paperwork. It also holds tax information, which is dealt with twice a year house and personal tax. All house bills, once these has been dealt with they are filed the following year into relevant folders. I also have stamps, envelopes, cards as well as photocopies of passports and driving licences in here.
We have a single bookcase document rack, where all post and paperwork is lodged until we do admin.This also contains any appointment cards.
All manuals are put in their own plastic sleeve which are all labelled with date of purchase and kept in a drawer. I prefer paper manuals, I like to have the manual in front of me if I have to resolve an issue.
I keep all paperwork, I prefer to have paper, although I do have scanned copies of important stuff as well.
we have a strong box for passports, certs and foreign currency, and insurance cards.