Financial strength lies in the ability to generate revenues  . The financial strength for the regional government can provide enough services to the society, like public goods and services. Government financial power would be obtained if individuals and organizations fulfill their tax obligations  .
Medan City is the capital of North Sumatera Province, Indonesia. Medan City is the third largest metropolitan city in Indonesia and the largest metropolitan city outside Java Island. Tax and Retribution Management Agency (BPRRD) in Medan City still has problems in the tax management related to manage tax revenues, such as tax and data collection from taxpayers. Collection of receivables will increase cash flow and will increase value  . The tax revenues importantly increase the financial strength; therefore, the strengthening of management function is needed. There are four management functions, planning, organizing, leading, and controlling  .
The Law of Republic Indonesia number 12 of year 2008 concerning Regional Government states that the regional government has an authority to manage its territory and this regional autonomy part of the unity of the state administration system. To support the autonomy, the Law of Republic Indonesia number 28 year 2009 concerning Regional Tax and Regional Retribution gives the regional to receive property tax as revenues. Besides the property tax, the Acquisition Duty, former as state tax, is to be the local tax and supports the regional financing. This fact creates some problems for the local government, such as Medan City. Medan City has difficulties to identify the data changing and to value the tax objects.
The government of Medan City has increased or revaluated the value of the land and building as based to impose property tax (NJOP) since 2014. This revaluation is consistent with Loan and McCuskey  that explains the based of the property tax should reflect the land actual values. The property tax is calculated by multiplying the NJOP by the tax rate. This new calculation has increased the property tax payable. Consequently, most of the taxpayers are reluctant to pay the property tax. This new formula or calculation is still a society’s question because the calculation is not fair.
Property tax is the main source of Medan City’s revenues. This fact is consistent with Babawale  that states property tax has played a significant role in financing local authorities in the several developed countries. The next significant revenues of Medan City are tax revenues from hotels, restaurants, entertainments, and parking that using self-assessment system for collecting. One main requirement in applying self-assessment system is the availability of supporting data. Medan City has problems in gathering this data and has limitation to confirm the correctness of tax paid and reported. The government estimates that there is a lot of tax revenues potency in its territory although the tax revenues targets are reached.
The self assessment system enforces greater accountability in terms of computational, recordkeeping and filing requirements upon taxpayers  . Tax compliance costs can be reduced by the simplification of tax legislation and reporting requirements, convergence of tax law with accounting standards and practices, technical training and internal staff development, audits and investigations processes.
The tax regulations have stated that the government has an authority to verify and to audit taxpayers to confirm the correctness of tax payments. The tax audits have direct and indirect effect to taxpayers’ complying   . The direct effect can increase the tax revenues. The indirect effect can generate the deterrence effect, where a tax audit is considered to deter potential tax evaders. However, there are still some collusive officers with taxpayers in conducting tax audits, consequently, the tax revenues received are lower than that of expected. The taxpayers who avoid taxes often make bribes and the tax officers who accept the bribes will hide the receipt illegally  .
From the facts, the formulation of the problem in this paper is the tax revenues collection still under the tax revenues potency. The purpose of this paper is to formulate tax intensification strategy and policies to increase tax revenues and to minimize the existing problems. This paper finds that Medan City needs to use tapping device, improve the human resources capacities especially in asset revaluation and tax audit, counsel and socialize tax payers, and coordinating with other related agencies.
Semi-structured interviews are conducted to explore and collect the respondents’ opinions about strengths, weaknesses, opportunities, and threats in collecting tax revenues in Medan City’s territory. Table 1 describes respondents and questions for them.
This study uses descriptive analysis and SWOT analysis to generate strategies. The strategies are discussed in the Focus Group Discussion (FGD) with the respondents that determined by purposively who understand about self-assessment system.
3. Results and Discussion
The results of this paper are divided in to:
Table 1. Respondents and questions.
1) Property tax, collected with official assessment system.
2) Tax revenues from hotel, restaurant, entertainments, and parking, collected with self-assessment system.
3.1. Property Tax
The property tax in this paper means that taxes are located in the cities and villages. The name of the law is PBB-P2 (Land and Urban and Rural Buildings Tax, namely Property Tax for Land and Building in City and Village). The summary of opportunities, threats, strengths, and weaknesses obtained from interviews with respondents are as follows:
O1. The formal education at property magister is available in Medan City.
O2. There is an opportunity for cooperation between colleges and the appraiser association.
O3. There is an opportunity for cooperation among immigration, financial technology, licensing agency, National Land Agency, and the Central Bureau of Statistics.
O4. Technology development.
T1. The society as taxpayers do not revise the data of the property as tax object, consequently the data of the property are not valid.
T2. There is distrust between the society and the government.
T3. The society is reluctant to pay property tax.
T4. The society does not understand the role of tax for the development.
T5. Property tax payables are large.
S1. Laws and regulations are adequate.
S2. The tax collection system is clear.
S3. There are enough funds to data validation, tax object revaluation, and other related programs.
S4. Taxpayers database are available.
W1. Not all property tax objects are validated and revaluated.
W2. The low discipline officers handle property tax object validation.
W3. Property tax object database are not updated and not yet integrated.
W4. There is no online payment.
W5. There are the lack of number and competency of officers in the tax object appraisers.
Focuss group discussions were conducted with officers in the Tax and Distribution Management Agency and lecturers to obtain strategies.
Based on SWOT identification, a TOWS matric is developed and shown as below:
・ S-O―propose strategies that could maximize the strengths by taking advantage of external opportunities.
・ W-O―propose strategies to overcome weaknesses by taking advantage of external opportunities.
・ S-T―propose strategies to enhance strengths through reducing the impact of external threat.
・ W-T―propose strategies aim at reducing internal weaknesses and avoiding external threats.
The summary of these strategies is presented in the following TOWS Matrics (Table 2):
The results of this SWOT analysis show the importance of integration of taxpayers databases with other agencies or units. This is in accordance with the statement that a detailed database can reduce the tax evasion and hence increase in tax revenue  . The strategies found are in line with the results of Savitri and Musfialdy  who said that services from tax officials and tax administration have a role in the relationship between taxpayer awareness, tax penalties, compliance fees and tax compliance.
3.2. Tax Revenues
These tax revenues are taxes from hotels, restaurants, entertainments, and parking. The summary of opportunities, threats, strengths, and weaknesses obtained from interviews with respondents are as follows:
O1. Supported by government regulations.
O2. Technology development.
O3. Cooperate with other agencies, such as the licensing section, the immigration, the university, the tax authority, the police, the civil service police unit, the attorney, the Supreme Audit Agency (BPK), and the financial and development audit agency (BPKP).
T1. There is collusion between the tax officers and taxpayers.
T2. The taxpayers tend to pay the tax revenues in a small amount.
T3. The taxpayers will avoid pay the tax revenues except there is a real advantage receipt.
T4. The taxpayers’ comply is low.
S1. The tax collecting system is clear.
S2. The budget is available.
S3. The taxpayers’ database is available.
S4. The tax officers have authority to audit the taxpayers to verify the taxpayers’ complying for the tax payment and other purposes in according with the regional tax regulations.
W1. There is a limitation of technical supporting staffs, namely taxes auditors, tax investigators, and bailiffs.
Table 2. TOWS Matrix for PPB-P2.
W2. There is no ability to have the correct sales data.
W3. There is a weak supervisory function on revenue potential.
W4. The organization structure is not based on functions.
3.3. TOWS Matrix
Focuss group discussions were conducted with officers in the Tax and Distribution Management Agency and lecturers to obtain strategies. The summary of these strategies is presented in the following TOWS Matrics in Table 3 as follows:
Some of these strategies are in line with a findings of Bird and Zolt  which says that at any given level of administrative capacity, many things can be done with appropriate advanced technology so that tax administration officials can collect and evaluate information and use existing data more effectively.
According to Wang et al.  , the increasing of revenues can be done by costumer-centric approach, reputation, channel management, estimating demand by big data, and fostering. This SWOT analysis has similar conditions with Wang et al.  , such as paying attention to costumers, having enough and good data, and fostering.
This strategy is related to the management functions, planning, organizing, leading, and controlling. The planning is conducted by BPPRD and relates to data. If data are complete and update, the tax collection will be better and the sum of the tax can be estimated. Organizing is to arrange the organization structure by function in order to archive the organization purposes. Leading is the leader’s direction to tax auditors in order to be more assertive in tax audits, improve tax knowledge, counsel and motivate taxpayers. Controlling relates to supervise to avoid tax fraud.
4. Conclusions and Recommendations
1) Data strategies are updating database, searching comparative data, fixing database, analyzing database, and sharing database to other related agencies.
2) Human resources strategies in BPPRD are improving knowledge and skill in accordance with their tasks and jobs, having assertive and honesty.
3) Taxpayers strategies are counseling and socialization, giving rewards and punishments, and providing convenience in paying taxes.
4) Coordinating and cooperating strategy with other related agencies are improved.
5) Controlling function strategy is increased especially for tax revenues potential.
There are some recommendations for BPPRD. BPPRD is suggested to state the
Table 3. TOWS Matrix for the tax revenues.
policies for applying the strategies that finding in this paper. The recommendations expected implemented in the short term are as follow:
1) Putting on the tapping device for monitoring transactions data from the taxpayers’ hotels, restaurants, entertainments, and parking.
2) Data validation and revaluations for property tax object.
3) Educating and training related to appraise property tax objects and to audit tax revenues from hotels, restaurants, entertainments, and parking as human resources strategies.
4) Counseling and socializations for the taxpayers and the society in Medan City’s regions.
5) Improving coordinating and cooperating with other agencies, include data sharing.
The authors gratefully acknowledge that the present research is founded by Directorate of Research and Community Service Directorate General of Strengthening Research and Development Ministry of Research, Technology and Higher Education accordance with research funding agreement and community service for fiscal year 2018.