In a scenario where you hold 51% ownership of the company and your partner holds 49%, you would technically have a majority stake and, therefore, the ability to make decisions that require a simple majority vote. However, the extent of your decision-making authority may vary depending on the terms outlined in your partnership agreement and the specific rights and powers granted to each partner.

Here are some factors to consider regarding decision-making authority:

1. **Majority Control:** With a 51% ownership stake, you would have the ability to control most decisions that require a simple majority vote, such as approving business strategies, hiring or firing key personnel, making financial investments, or entering into contracts.

2. **Reserved Matters:** Your partnership agreement may specify certain "reserved matters" or critical decisions that require unanimous or supermajority approval, regardless of ownership percentages. These could include major strategic decisions, changes to the company's structure or ownership, or significant financial transactions.

3. **Veto Rights:** Even if you have majority ownership, your partner may still have veto rights or specific decision-making authority over certain areas of the business, depending on the terms negotiated in your partnership agreement. This could limit your ability to unilaterally make decisions in those areas.

4. **Board Structure:** If your company has a board of directors, the composition of the board and the allocation of voting rights among directors may impact decision-making authority. You may have control over board appointments or hold additional voting power as the majority owner.

5. **Management Structure:** The day-to-day management and operation of the company may also affect decision-making authority. Depending on your roles and responsibilities within the company, you may have more influence over certain aspects of the business than others.

6. **Relationship Dynamics:** Effective decision-making in a partnership often depends on collaboration, communication, and trust between partners. Even if you technically have majority control, maintaining a positive working relationship with your partner and considering their input and perspectives can be essential for the success of the business.

Ultimately, the distribution of decision-making authority in a partnership is influenced by a combination of ownership percentages, legal agreements, governance structures, and interpersonal dynamics. It's crucial to have clear and transparent communication with your partner and to document decision-making processes and responsibilities to avoid misunderstandings or disputes down the line. If there are specific concerns or considerations regarding decision-making authority, it's advisable to consult with a legal advisor to ensure that your partnership agreement reflects your intentions and protects the interests of both partners.