A realm in Crusader Kings III rarely dies at the hands of a foreign invader — it dies when its own dukes stop paying, stop fighting, and start plotting. The feudal contract is the single most important lever you have for preventing that collapse, and this guide breaks down how vassal obligations, opinion, and special contract terms combine to determine whether your kingdom outlives its founder.

Crusader Kings III, developed by Paradox Development Studio and published by Paradox Interactive, released on September 1, 2020 on PC, and has been supported with expansions and free updates ever since. One of the most deliberate changes it made over its predecessor was replacing the old blanket realm laws of Crusader Kings II with individual vassal contracts. As the developers explained in official forum responses during development, the goal was to more accurately represent feudal structure and to create more personal drama between lieges and their vassals — and the result is a system where every powerful duke is a negotiation waiting to happen.

How the Feudal Contract Works

Only rulers with the feudal government form negotiate obligations individually with each vassal. Every feudal vassal has a contract specifying two core obligations: taxes and levies. Taxes determine the share of income a vassal sends to their liege, while levies determine how many soldiers that vassal contributes to the liege’s armies. Both obligations run across five graded levels, from effectively nothing up to punishing rates.

Three hard rules govern every contract modification, and understanding them is the foundation of realm stability:

One change per lifetime. You can modify a given vassal’s contract only once. After that, the terms are locked until the vassal dies and the contract resets with their heir. This makes patience genuinely valuable — a bad deal signed in haste can define your relationship with a powerful family for decades.

Fair trade or Tyranny. When you change an obligation in your favor, you must roughly balance it with a concession, or the change counts as a tyrannical act. Tyranny damages your opinion with characters across the entire realm, not just with the vassal you squeezed. Common balancing moves include lowering one obligation while raising the other, or granting a contractual right such as council privileges or title revocation protection.

Adjacent steps only. You cannot jump from Normal to the maximum in one negotiation — obligations move one level at a time. Multi-level changes require spending a hook.

The third pillar of the system is the hook. Hooks — favors owed, secrets uncovered, or leverage gained through schemes — let you force an unfavorable change without compensation and without the tyranny penalty. A spymaster hunting for secrets is, in practice, also your contract renegotiation department.

Why Obligations Equal Stability

The contract’s true purpose isn’t income; it’s opinion management at scale. Raising a vassal’s obligations inflicts a lasting opinion penalty against you, and the penalties for increasing demands are substantially harsher than the goodwill you earn for lowering them. That asymmetry is the whole game of feudal politics.

Low opinion vassals join factions. Factions issue ultimatums — lowered crown authority, a pretender on the throne, or outright independence — and when ultimatums are refused, those factions become wars. Paradox’s developers noted during development that a realm as mighty as the Holy Roman Empire can be humbled by a smaller kingdom after losing a few liberty wars, precisely because successful rebellions tend to lower vassal obligations. Weak contracts feed weak armies, and weak armies invite the next factions. The spiral works in both directions: well-managed contracts let a medium-sized realm punch far above its weight.

This is why the early-game optimal play is almost always restraint. When your vassals are small, raising their taxes from Normal to High gains you very little gold — a percentage increase on a tiny base — while the opinion penalty is a flat, meaningful number that makes every scheme, factionfaction. An in-game group or nation players can align with or fight against, with its own goals and reputation system., and refusal more dangerous. Experienced players leave contracts at Normal for years, then renegotiate selectively once the realm is rich enough that the extra income actually matters.

The Fine Print: Contract Rights

Beyond taxes and levies, contracts can carry special rights that trade favor back and forth between liege and vassal. Several are gated behind cultural innovations, so the depth of your contractual toolbox grows over the campaign.

  • Title Revocation Protection shields a vassal from having their titles taken. Vassals value it highly, making it excellent currency for balancing an obligation increase.
  • Council Rights grant a vassal the ability to demand a council seat at will. Vassals love this, but your powerful vassals resent seeing the privilege handed out, so scatter it sparingly.
  • War Declaration Rights let a vassal declare war even when crown authority would otherwise forbid it, at reduced cost for internal wars — a concession that increases vassal opinion but loosens your grip on internal peace.
  • Forced Partition locks a vassal into partition succession, fragmenting their lands among heirs on death. This is the liege’s best long-term tool against over-mighty subjects, since a duke whose lands split every generation can never consolidate into a rival. It costs opinion, but it’s frequently worth it.
  • Coinage and Fortification Rights (unlocked through innovations) shift economic and defensive advantages to the vassal at a cost to your own development and construction.
  • Religious Rights protect vassals of a different faith from forced conversion, useful for holding together multi-faith realms without constant opinion bleed.

Special Contracts: March, Scutage, and Palatinate

Duchy-tier vassals and above can also receive one special contract role, which restructures their obligations around a specific purpose:

  • Scutage trades levies for taxes — the vassal pays significantly more gold but provides far fewer troops. For a late-medieval liege running professional men-at-arms, this is often the best deal in the game: gold from a scutage vassal funds standing soldiers that outperform peasant levies many times over, and your personal military strength discourages factions.
  • March does the inverse, cutting taxes while boosting the vassal’s defensive military capacity. Grant it to border dukes you expect to fight your wars or absorb enemy invasions.
  • Palatinate reduces both obligations while granting the vassal prestige and standing among their peers, with some prestige trickling back to you. It’s a diplomatic tool for keeping a powerful dynast loyal when you can’t afford to antagonize them.

Because these multiply the base obligations, they combine with the tax and levy sliders. A duke on high taxes under a scutage contract produces income worth real concessions; a march lord with maximized levies becomes a shield wall on your frontier.

Other Government Types Play by Different Rules

The individual contract system is unique to feudal government, which is one reason feudal realms feel so different to run. Clan vassals scale their contributions with their personal opinion of the liege — keeping the family happy is literally your tax policy. Tribal vassals scale with the liege’s level of fame, which makes prestige farming the tribal equivalent of contract negotiation. Republic vassals pay fixed obligations that can’t be modified at all, making them unglamorous but dependable. Lieges who inherit or conquer across government types need to recalibrate their stability strategy for each vassal block.

Build Path: Renegotiating Without a Civil War

A practical sequence for new rulers:

  1. Inherit unstable, act patient. Opinion penalties from obligations persist through lifetimes, but a fresh liege starts with reset relationships in most other respects. Don’t renegotiate on day one unless a vassal is already on terms you can’t live with.
  2. Push crown authority when secure. Higher crown authority adds floors to vassal contributions and unlocks succession laws that keep your own realm from splitting — but it angers vassals, so time it for moments of strength.
  3. Harvest hooks before you need them. Keep your spymaster on scheme duty and your intrigue lifestyle pointed at leverage. A hook converts a tyrannical land grab into a clean negotiation.
  4. Trade sideways, not upward. Swapping levy obligations for tax obligations (or vice versa) to suit your military model is usually better than raising both. Specialize each vassal.
  5. Give council seats through contracts. If a powerful vassal is going to end up on your council anyway, grant the right contractually and take something in return.
  6. Reassess at every succession. Each vassal death reopens their contract. Set a mental note, or you’ll inherit another generation of grandfathered bad terms.