Secondary work is important to Smallholders. It can be used in lieu of taxes, to earn cash or to supplement the holdings food supply.
Civic Work - A few days a year, working on a Road Crew for example, can help pay taxes for both the individual and the smallholding. It might also include working on the palisade, rubbish disposal or any other sort of low-skill work. It is, just about, the only way to pay taxes without handing over coins.
Militia - serving as a reservist or member of the militia / posse. This will often get a slight reduction in taxes, and may even earn a few small coins, occasionally.
Farm Labourer - The larger farms all employ part-time and casual staff, with many extra labourers required when planting or harvesting. Everyone makes sure they have some time available for that work, even if it is only one day a week - it is almost guaranteed, and it generally pays cash.
Regular work - If there is a town or village nearby, some members of the family might have regular work - perhaps working at the Inn/Tavern, or one of the other businesses, or taking in laundry. They are still expected to help out around the holding, when they are at home.
Craft work - It could be making simple furniture, clothing, leather work - or indeed any craft. A milking stool, or a small table, sold at market every-so-often can bring in a good few coins.
Forager - A catch-all for people going out looking for berries, mushrooms, or other wild food - through to the 'poacher' taking a rabbit or game bird with their sling - what ever they bring in goes to supplement the family diet - although excess is sold off in the market.
Trapper/Fisher If there is suitable Wilderness/Water nearby.